RE: Is it possible to make the "Return action" field in PO line (setup tabpage) mandatory for PO returns ?
Hello Lionel VRAC,
Currently there is no standard validation is available to set the Return action mandatory in PO.
However you can go for below options as per your requirement.
1) Either; set the default return action in Return action default field in Procurement and sourcing > Setup > Procurement and sourcing parameters > General; provided that you will always use the same action as a default value in all PO return orders. Once this is set, then it will always pick the same default return action value from the parameters form.

2) Or; do a code modification to set the return action field mandatory in the PO.
Kindly check and provide your feedback.
Best regards,
Sourav Dam
Kindly mark this thread 'Yes' if this is answered your query which may help other community members in this forum.