Incoterms in outbound delivery order

Hello

In our business we change the incoterms even after picking and packing of items. The field is not open in outbound delivery order to change. I have tried to add warehouse activity status started and unchecked the field display in the field control profile scdl/out_prd_standard and tried even the same for system profile for the incoterm field but this has not resulted in making the field editable even as soon as ODO is created.

I cant understand why does the system not open this field, what am I missing?
Any clues.

Regards,

Amit