Construct a multiple account assignment from purchase requisitions placed in delivery schedule tab

Hi experts:

I have several purchase requisitions for the same material, same vendor, but different account assignment (account assignment category = "K", each PR with a Cost Center).

In Purchase order creation I use the procedure:

1. Drag and drop the first PR in shopping basket

2. For the other requisitions, I use the Shopping basket from Delivery Schedule tab

By this way i get a single line in PO from multiple purchase requisitions, however the account assignment assume the cost center from first PR.

It is possible to construct a Multiple Account Assignment from purchase requisitions placed in delivery schedule tab?

Note: This question arises from the need of combine PR's for the same material in one single line of PO respecting the account assignment.

Thanks & Regards,

Felipe Garzón Quintero