1. A system comprising: a computer system comprising one or more hardware platforms for executing computer software; and computer software deployed on the computer system as an instance of a foundation layer, the instance of the foundation layer for use in a services architecture design for implementing services-based applications in an enterprise application, the foundation layer used to support application software deployed in an application layer deployed on the computer system, where the application software includes at least one deployment unit in the application layer, where each deployment unit includes one or more process components deployed together in a single computer system, each deployment unit defining the limits of an application-defined transaction for performing application-relevant operations, where multiple instances of a single deployment unit can be deployed on separate physical computer systems, and wherein instances of the foundation layer are operable to be deployed on each of multiple hardware platforms that are distinct and separate from each other to support the application software deployed as the instances of one or more deployment units on the multiple computer systems without duplication of instances of the deployment units in a single computer system, and wherein the instance of the foundation layer deployed on the computer system contains a set of fundamental entities used by the at least one instance of the deployment units deployed on the computer system, and wherein the instances of the deployment units deployed on the computer system communicate directly with the entities in the instance of the foundation layer deployed on the corresponding computer system, the instance of the foundation layer implementing a plurality of business objects, the business objects comprising master data objects, the master data objects comprising: a business partner master data object, wherein the business partner master data object represents a person, organization or group of persons in which a company has a business interest; an employee master data object, wherein the employee master data object represents a person who contributes or has contributed to the creation of goods or services for a company; a clearing house master data object, wherein the clearing house master data object represents an organization which provides the services concerning credit card payments; a payment card master data object, wherein the payment card master data object represents a payment medium; a customer master data object, wherein the customer master data object represents a business partner with whom a business relationship exists; a supplier master data object, wherein the supplier master data object represents a business partner who provides materials and/or services; a tax authority master data object, wherein the tax authority master data object represents a business partner for value added tax declaration; a house bank master data object, wherein the house bank master data object represents a business partner providing services for our company, such as account management or lock box; a sales arrangement master data object, wherein the sales arrangement master data object represents an arrangement that is made by a sales unit for a customer, and is used for sales transactions; a procurement arrangement master data object, wherein the procurement arrangement master data object represents an arrangement that is made by a purchasing unit for a supplier, and is used for procurement transactions; a company tax arrangement master data object, wherein the company tax arrangement master data object represents a contractual arrangement based on the agreement between a company and a tax authority for a tax type; a payment agreement master data object, wherein the payment agreement master data object represents the agreement between a company and a business partner concerning the handling of incoming and outgoing payments; an organizational center master data object, wherein the organizational center master data object represents a building block of the enterprise model which represents a node in an organizational structure of the extended enterprise; a position master data object, wherein the position master data object represents an object of the enterprise model representing a specific post in an enterprise that can be occupied by holders and is therefore a placeholder for persons in an organizational structure; a cost center master data object, wherein the cost center master data object represents an organizational unit that represents a defined location of cost incurrence and for which costs are recorded separately; a reporting line unit master data object, wherein the reporting line unit master data object represents the organizational unit in the personnel reporting line of the enterprise; a company master data object, wherein the company master data object represents a financially and legally independent, locally unbound entity registered under business law; a production center master data object, wherein the production center master data object represents an organizational unit that is responsible for organizing and executing the delivery processes as well as the processes in site logistics; a distribution center master data object, wherein the distribution center master data object represents an organizational unit that is responsible for organizing and executing the processes in production; a permanent establishment master data object, wherein the permanent establishment master data object represents an organizational unit that represents a localized subdivision of a company whose business activities are subject to uniform fiscal treatment; a sales unit master data object, wherein the sales unit master data object represents responsible for planning, realizing and administering of sales force processes; a purchasing unit master data object, wherein the purchasing unit master data object represents an organizational unit responsible for strategic and operational purchasing; a service unit master data object, wherein the service unit master data object represents the organizational unit responsible for processes covering all aspects of a customer service and a support center's business; a profit center master data object, wherein the profit center master data object represents an organizational section of the enterprise for which a separate period result is determined and used for profit-oriented rating or control of the section activities; a segment master data object, wherein the segment master data object represents a business branch of a company for which a closing statement is to be created based on the segment reporting regulations within the context of the particular accounting principle; a program master data object, wherein the program master data object represents an organizational unit that represents a complex temporary undertaking to achieve subordinate objectives within one overall strategy; a material master data object, wherein the material master data object represents a tangible product such as a sellable article, packaging, auxiliary material or expendable supplies; a service product master data object, wherein the service product master data object represents an intangible product such as consulting and hotline service; a warranty master data object, wherein the warranty master data object represents an intangible product such as a warranty for electronic devices and machinery; an individual material master data object, wherein the individual material master data object represents a tangible product; a product category hierarchy master data object, wherein the product category hierarchy master data object represents a hierarchy for structuring product categories; an equipment resource master data object, wherein the equipment resource master data object represents a permanently installed operating facility or a group of identical operating facilities providing capacity to perform specific services; a vehicle resource master data object, wherein the vehicle resource master data object represents a means of transportation or a group of identical means of transportation providing capacity to perform transportation services; a labor resource master data object, wherein the labor resource master data object represents an employee or a group of employees with the same skills and qualifications that provides capacity to operate specific devices or to perform specific tasks; a resource group master data object, wherein the resource group master data object represents a grouping of individual resources that provide similar services or have similar physical and functional characteristics; a capacity aggregation group master data object, wherein the capacity aggregation group master data object represents the total of the capacities of several resources that provide identical services and can be used for logistics or production planning and scheduling purposes; a location master data object, wherein the location master data object represents a geographical place used, for example, for communication of place information in business processes; a transportation zone master data object, wherein the transportation zone master data object represents geographical locations that may be considered collectively for modeling or planning transportation routes or transportations; a transportation lane master data object, wherein the transportation lane master data object represents a connection between two locations in a supply chain model used for planning cross-location product movements; a supply planning area master data object, wherein the supply planning area master data object represents groups of requirements, stocks and other requirements coverage elements with the purpose of being together taken into account in net requirements calculation of supply planning; a logistics area master data object, wherein the logistics area master data object represents an object that describes the internal structure of a logistics facility; a source and destination determination rule master data object, wherein the source and destination determination rule master data object represents a rule to determine the search method for locating the source for stock retrieval or the destination for stock storage; a storage behavior method master data object, wherein the storage behavior method master data object represents a set of rules distinguished by the manner in which a logistics area or resource is managed; a quality issue category catalog master data object, wherein the quality issue category catalog master data object represents a catalogue of quality issues for the rating of different aspects of quality management; a sample drawing procedure master data object, wherein the sample drawing procedure master data object represents how samples are taken for an inspection, such as the number, quantity, and subcategory of samples; an inspection rule master data object, wherein the inspection rule master data object represents how an inspection of a given object must be performed; a document master data object, wherein the document master data object represents a carrier of electronic information, including control and monitoring information; a production model master data object, wherein the production model master data object represents a model of a production process in a production center that is specified by a network of production segments; a production bill of material master data object, wherein the production bill of material master data object represents a complete, structured list of the components that make up a product or a family of similar products; a production bill of operations master data object, wherein the production bill of operations master data object represents a detailed description of how a product is to be produced; a released planning production model master data object, wherein the released planning production model master data object represents a released version of a production model in a production center that contains all details from the production bill of operations and production bill of material necessary for the planning of a production process; a released execution production model master data object, wherein the released execution production model master data object represents a released version of a production model in a production center that contains all details from the production bill of operations and production bill of material necessary for the execution of a production process; a production segment master data object, wherein the production segment master data object represents part of a production process in a production center specified by a network of operations and assigned materials for the production of a material; a site logistics bill of operations master data object, wherein the site logistics bill of operations master data object represents a detailed description of how a product is to be moved, packed and otherwise dealt with during site logistics processing; a site logistics process segment master data object, wherein the site logistics process segment master data object represents a set of operations for moving, packing or checking stock in a logistics division, which specifies a segment of a site logistics process; a site logistics process model master data object, wherein the site logistics process model master data object represents a model that defines a logistic process managed by a logistics division, by specifying a sequence of process segments; a released site logistics process model master data object, wherein the released site logistics process model master data object represents a structure that defines a logistic process in a logistics division by specifying a sequence of process segments; a supply quota arrangement master data object, wherein the supply quota arrangement master data object represents a distribution of material requirements or goods to different sources of supply, business partners, or organizational units within one's own company; a source of supply master data object, wherein the source of supply master data object represents an object that describes a logical link between a possible source of products and a possible target; an installed base master data object, wherein the installed base master data object represents a container that holds structured information of business components and their compositions, as well as their business features; an installation point master data object, wherein the installation point master data object represents the time-dependent assignment of a business component to installed bases; a sales price specification master data object, wherein the sales price specification master data object represents the specification of a price, discount or surcharge to be used in sales and service documents; a sales price list master data object, wherein the sales price list master data object represents a list of price specifications with respect to common identifying criteria; a procurement price specification master data object, wherein the procurement price specification master data object represents the specification of a price, discount or surcharge to be used in procurement documents; an identity master data object, wherein the identity master data object represents a set of attributes identifying a person together with all of his user accounts in a system landscape; an exchange rate master data object, wherein the exchange rate master data object represents the relative value of two different currencies for a time span; a bank directory entry master data object, wherein the bank directory entry master data object represents a bank or institution capable of performing financial transactions; a logistic unit master data object, wherein the logistic unit master data object represents an object that represents an item of any composition, which is used for storage, movement, and packing; a logistic unit usage master data object, wherein the logistic unit usage master data object represents an object that represents a logistics purpose for which logistic units are grouped; a logistics task folder master data object, wherein the logistics task folder master data object represents the local work organization on the shop floor; a service issue category catalog master data object, wherein the service issue category catalog master data object represents a structured directory of issue categories that describe business transactions in customer service from an objective or subjective point of view; a packing bill of material master data object, wherein the packing bill of material master data object represents a complete and structured list of components that defines the packing structure of logistic units; an identified stock master data object; and a key performance indicator master data object.