Create Return to Vendor via Delivery

Hello

While creating the return PO to vendor the shipping tab is generated automatically with shipping data Sales Org 6500, DistChanel 11by default. I want to use the Sales Org 6500, but DistChanel 12, could you please advise what to do and where in IMG can I change it?

What is responsible for it , that the DC 11 is chosen by default?

Regards

M