Qty_makeup on a sales order print/report

SUGGESTED

I'm trying to add "Qty_makeup" to a sales order so I have a column for the qty on the sales order, and next to it, a column stating qty I can make up from available stock.

For some reason, I can not get this to work, is there anything I may be missing to stop this from working, or am I misunderstanding what "QTY_MAKEUP" is meant to represent.

Briefly, I have a existing report, which has "SOP_ITEM.QTY_ORDER" and next to it " STOCK.QTY_IN_STOCK - STOCK.QTY_ALLOCATED" to show me what free stock I currently have, which works perfectly. I change " STOCK.QTY_IN_STOCK - STOCK.QTY_ALLOCATED" to  "STOCK.QTY_MAKEUP" but when I run the report it just states 0 regardless if I have stock to build the part or not.