SAP Message WRF_MRM_ASSIGN030 - Incorrect value returned by BAdI method &1; &2, &3

Diagnosis
BAdI method &V1& returned value &V3& for field &V2&. This value is notallowed for this field, however.

System Response
The system ignores the value returned by the BAdI method and uses theoriginal value instead.

Procedure
Contact your system administrator.