SAP Message QM193 - For this purchasing document a maximum of &1 &2 can be returned

Diagnosis
A maximum &v1& &v2& can be returned for this purchasing document. Areturn delivery of the required amount with reference to thispurchasing document is therefore not possible.

Procedure
Assign another purchasing document or material document to thenotification, if you want to create a return delivery for the entirequantity with reference to a purchasing document.