How to set F4311.PROV = blank / 0

Hi,

Blanket Order to Purchase Order (PO)

PO to be repriced through R45620

We tried creating a blanket order (unit cost was not manually entered, fetched from item cost), and the PROV of the blanket order was blank ---> OK
But, when we converted it to purchase order (PO), the PROV of the PO was set to 1.

I'm aware that system automatically sets it to 1 when:

1. Any entry of a price manually in order entry.

2. Copying the order from another order

3. Blanket Order Release

4. Creating Credits from History

Can we prevent the blanket order release to set the PROV to 1?