SAP Message 0C055 - The first key field of table & is not MANDT DOCUMENTATION DiagnosisTable &V1& cannot be defined as a message destination for one ofthe following reasons:The MANDT field is not the first key field of the table.The domain assigned to the MANDT field does not belong to the same datatype as the MANDT domain.The domain assigned to the MANDT field does not define the same fieldlength as the MANDT domain.The destination is not created.ProcedureCheck the definition of table &V1& in the ABAP/4 Dictionary andcorrect it according to the requirements listed above.