If you have the setting ticked to allow reopen PO on return, you can copy GRPO to return, then the PO lines will be re opened for you to change.
The setting is in document settings, per document for PO ( and SO)
If you have the setting ticked to allow reopen PO on return, you can copy GRPO to return, then the PO lines will be re opened for you to change.
The setting is in document settings, per document for PO ( and SO)