For your better understading, I have attached:
Qty on hand which just shows description and NOT customer:
And if you go to Delivery Note for identifying which customer took delivery then you can’t see quantity:
Also attached inventory quantity summary of the item which shows customer:
Since manager doesn’t show deliveries of each customer in any module including the Delivery Note itself, so the delivery notes has to be opened one by one manually of each item and total all the qty of each item to create invoice against that particular customer which is really cumbersome.
I have 117 deliveries against 73 invoices as of now and shall continue until day close.