Committing backorder quantity in maintenance work order

Hi all, 

I'm trying to figure out how to commit quantities that are now in backorder (F3111.SOBK > 0) in a maintenance work order.

The commitment is made during work order entry, by configuration on P3009. 

So when a maintenance work order is entered, the quantities are hard committed.

In case there's not enough stock for the full quantity, part of it is put on backorder. 

The quantity is then shown in bold in the WO parts detail P17730.

After purchasing this item and increasing stock, I'd like to commit that quantity that was originally on backorder, and no longer have the quantity in bold.