1. A method implemented by a computer in response to execution of program code by a processor of said computer, comprising: receiving a definition of an extension field to be added to a first node of a business object; determining to generate metadata for a data type enhancement object associated with the extension field, the determination being based on a switch framework that indicates which extensions are active or not active in a first client; generating metadata for the data type enhancement object associated with the extension field; and generating an ABAP dictionary proxy object based on the data type enhancement object, wherein the ABAP dictionary proxy object describes the extension field in a sub-structure of a first field of the ABAP dictionary proxy object; wherein a field of the first node of the business object and to which the extension field is to be added is defined by a first data type and a first attribute indicates whether the first data type is dynamically extensible; wherein a field of a second node of the business object is defined by a second data type and a second attribute indicates whether the second data type is dynamically extensible; and wherein the first attribute indicates that the first data type is dynamically extensible; the method further comprising: specifying that the first attribute is editable; specifying that the second attribute is not editable; synchronizing a switch setting for the data type enhancement object and a switch setting for a corresponding business object enhancement object; providing a switch setting indicating that a business function is active in the first client; and allowing addition of an extension in the first client without requiring that a second client reload all data into a data buffer.