Message SAP WRMA012 - Article &1 is not a value-only article

Diagnosis
Article &v1& is not a value-only article.

Procedure
You have carried out RMA difference postings on the article.
Such postings are permissable only on value-only articles. Change thearticle in the master data or in the RMA assignment for the materialgroup (view V_WRMA_t023).