Reserved Quantity on Inventory for 3.70

BGI

In previous versions you could put a flowfield on a sales line to find out which quantity was reserved on item ledgers for the sales line.

In 3.70 the reservation entries are split up so i don't see any direct means of doing this same thing again in 3.70
MAybe some of you have had the same problem an know of a solution. I need a flow field because i need to doo some filtering to know which lines are freely available from stock to deliver, an which ones are not (reserved on purchase, production...).

Rgds
Benny Giebens