Cannot change Ship to on SO Line

Inventory org is WMS (warehouse management) enabled. There is a processing constraint in the system that does not allow Changing the ship to location on SO line once the SO line is pick released. For one responsibility, i have authorized so I can change the ship to location even after line is pick released. I am able to change the ship to location for a SO line that is pick released for another org that is not WMS enabled from the same responsibility. But for a WMS org, I cannot change the ship to location after pick release. Throwing the warning and not letting me save. Message: The update is not allowed because the source line is under WMS control. I tried unassigning the delivery detail from the delivery. Also tried to unpack the LPN in staging and found that it is not possible to unpack an LPN once it is staged for delivery. Please help.