SAP Message WM426 - Value-only material & (possibly reference material) not fully maintained DOCUMENTATION DiagnosisWhen you attempt to list a value-only material, the following problemscan arise:The R/3 Retail status of the material is not maintained to a high enoughlevel (it should be at least 0, 5 and 6)No value-only material has been entered in the material group masterThe value-only material has not been createdProcedureMaintain the necessary data.