Unexpected Margin Rate is added to Purchase Order items when it is created from a Material Request

Hello everyone.

There is this strange price adjustment behavior when you create a PO from a Material Request that has a Sales Order linked to it.

The new PO items would have their rates automatically updated. When I examine them in the Edit panel , I saw that there are Margin Rate and Discount Amount applied to to the items.
It doesn’t happen when I use Get Item From > Material Request, or create directly from Sales Order.

If it is not a bug is there any ways to disable the pricing changes? Thank you.

New PO


Material Request