Quantity Correction, Drop Ship Item Ledger

rubberducky

Hi mibuso community, recently I got stumped by this issue and wanted to know if anyone here has an idea:

Some forms have a flowfield that sums up "Item Ledger Entries" excluding all drop shipment to show the inventory of an item.
Seems right, since dropshipments should always have a purchase and a sale that sum up to 0.

Now we have an item that shows an inventory of 100 in those forms and 0 on the Item Card.
Looking at the item ledger entries I found that some years back someone managed to cancel a purchase shipment belonging to a drop shipment without affecting the corresponding sale.

So the drop shipment "inventory" has an incorrect value of -100.

How do I post a item ledger entry that negates the -100 and also has the drop shipment checkmark?