Diagnosis
You want to transfer user fields with a BAPI for Asset Accounting usingthe BAPI_TE_ANLU table extension. However, the SAP enhancement that isconnected to these fields is not linked to an active customerenhancement, or the CI_ANLU structure has not yet been created.

Procedure
The use of user fields is explained in SAP enhancement AIST0002.
If you have not defined user fields, you cannot transfer anything inthe EXTENSIONIN parameter when calling the Create and Change BAPIs ofAsset Accounting. And you also cannot request user fields in theREQUESTEDTABLESX parameter when calling GETLIST-BAPIs.