How create a purchase order without imputation using bapi: BAPI_PO_CREATE1

Question

Hello Forum
I have an request for purchase order with imputation K (cost center, EBAN-KNTTP). During the liberation of the request for purchase order, and using the Bapi: BAPI_PO_CREATE1, I want to create a Purchase Order without imputation (imputation empty or charge empty).
The system displays the following error: The request for purchase order, item (position) 10, is attributed to another order...
I imagine that is because the request for purchase order has imputation (charged) K and the purchase order will have no type of imputation (imputation empty).
However, manually, Yes, I can create the purchase order. That is, I first release, the request for purchase order. Then I create the order of purchase using ME21 and with reference to request for purchase order, and when SAP returns the items of the request for purchase order, I manually remove the imputation K, and these items to become the purchase order.
Please support me want to know how to resolve this case, why can not I create a purchase order without imputation to from the request for purchase order with imputation K, using Bapi
Thank you.
Greetings,

Answer 1

Hi,
In the item overview of the purchase order creation screen (ME21N), you have a column Purchasing Doc and next it item no.  You can give the existing purchase order number here with item no which will create a purchase order, and changes can be made wherever you require.
Hope this helps.
Thanks
Krishna.