Valuated project stock not allowed with customer stock.

What causes this issue?

The entered WBS element &V1& manages a valuated project stock. At the
same time, a sales order stock is managed on the sales order item. This
combination is not allowed since different valuation methods within a
project are not allowed.

System Response

Processing is not continued.

How to fix this error?

Enter a WBS element that does not manage a project stock or only a
nonvaluated project stock, or change the inventory management for your
sales order item in the valuation class.

Error message extract from SAP system. Copyright SAP SE.