I want to create PO Return for subcontracting item category.But when I tried to create it,the system prompted an error message:"Returns not possible for subcontracting items Message no. ME 548". Then I used SPRO to check the system message and there is no such a message in the system.Also I added this message into my system and set the catetory to "W". But when I create the PO Return,the same error occured.
What should I do then?