Requisition mapping set based on User department

Hi team!

We have the following situation:

We created a mapping set based on the purchasing category and linked all accounting segments in this mapping set.

The purchasing category will always be linked to a Master Item.

See whats the customer needs:

When the requester selects an item and adds it to the shopping cart, the item will have the accounting combination based on the purchase category to which it is linked. We've already managed to make it work.

However, the customer wants the cost center segment of the accounting combination brings the requester's department, to prevent him from inserting another cost center that is not his own, as if he could create requisitions only for his cost center