Customer change: Copy control sales doc to sales doc

Dear Experts

We have a requirement of creating Sch Agreement w.r.t. Inquiry where in target doc will have different customer than the source document.

We have maintained Copying requirement routine 0002 in copy control, but still customer is not allowed to changed when Sc Agreement is created w.r.t. Inquiry.

Also secondly, the total order quantity from the source document is not getting copied as Target quantity in the target document.

Please help me out.

Regards

Kailash