13. A non-transitory computer-readable storage medium having stored thereon computer executable program code which, when executed on a computer system, causes the computer system to perform steps comprising: generate a Service Adaptation Definition Language (SADL) definition for each of a plurality business entities associated with different model layer frameworks, the SADL definition being based on an intermediate representation of each of the plurality of business entities; and publish the SADL definition as a service of a SADL engine configured to delegate at least one of query, create, read, update and delete operations associated with the business entities, wherein the SADL engine interacts with a user interface defined using at least two of the plurality of business entities, the new user interface working with the different model layer frameworks of the at least two of the plurality of business entities.
13. A non-transitory computer-readable storage medium having stored thereon computer executable program code which, when executed on a computer system, causes the computer system to perform steps comprising: generate a Service Adaptation Definition Language (SADL) definition for each of a plurality business entities associated with different model layer frameworks, the SADL definition being based on an intermediate representation of each of the plurality of business entities; and publish the SADL definition as a service of a SADL engine configured to delegate at least one of query, create, read, update and delete operations associated with the business entities, wherein the SADL engine interacts with a user interface defined using at least two of the plurality of business entities, the new user interface working with the different model layer frameworks of the at least two of the plurality of business entities. 15. The non-transitory computer-readable storage medium of claim 13 , wherein the SADL engine includes a query module configured to delegate a query to an Advanced Business Application Programming (ABAP) Query Interface.