[Bug]: Undo Shipment of Drop Shipment generates Positive = false entries causing wrong inventory valuation

Describe the issue

When a drop shipment PO is received, the corresponding SO is also shipped.
if the customer decides to undo shipment on that sales order, the generated item ledger entries will generate Sales entries with positive quantities and Positive is set to false. This causes wrong output on the inventory valuation report.

Expected behavior

The generated item ledger entry of undo shipment should have Positive = true

Steps to reproduce

1. Create SO with drop shipment items
2. Create PO for the drop shipment SO
3. Receive Purchase Order which will also ship the corresponding drop shipment
4. Go to the Posted Sales Shipment Generated
5. Undo Sales Shipment
6. The Sales Shipment will be undone along with Purchase Receipt as well.
7. Two item ledger entries are generated
8. Both Positive = false (One for the purchase receipt reversal which is correct, and another for the sales shipment reversal which is incorrect and has to be = true).

Additional context

No response

I will provide a fix for a bug

• I will provide a fix for a bug

Reproduce the drop shipment undo flow described in the issue and inspect the two generated item ledger entries, especially the sales shipment reversal and its Positive value. Done means the sales shipment reversal has Positive=true while the purchase receipt reversal remains false, and the inventory valuation report reflects the correction.