Hi Ludwig. I agree. I've been checking each element of the costing version.
Both the raw material item and the manufactured item are attributed with a item model group/Inventory Model of standard cost.
Both also have a calculation group of DEF which specifies a cost model group of "Item Cost Price".
Both also have a cost group of MAT which is a Cost group type of "Direct Materials" and variable cost behaviour.
The costing type is standard cost
Block changes and Block activation are both set to No.
There is a tick on Restrict calculations in the calculation tab, which is disabled.
In this tab, I have the Production box ticked, and the Purchase order unticked, and the result is Zero. If I also tick the purchase order box, the purchase price on the item is used and appears in the pending price. Of course I don't want to use the PO. I assume the production order box indicates that a BOM calculation is made to determine the new item cost but this is being ignored or blocked.
Maybe I need to debug the calculation method.
Regards. James.