[Subcontracting] Create TO to Subcontractor honors reduced open WIP line (Bug 639382)

[ChethanT]

Fixes ADO bug 639382.

Problem

'Create Transfer Order to Subcontractor' failed with Nothing to create. No components or WIP to transfer after a WIP transfer line was reduced (e.g. qty 5 -> 3), instead of creating the remaining qty 2.

Root cause

CheckCreateWIPTransfer had an early IsEmpty() short-circuit: if any open WIP transfer line existed it returned false. Coverage was measured only against posted WIP ledger entries, never against open transfer-line quantities, so a reduced (not deleted) line blocked all further creation.

Fix

• Removed the IsEmpty() short-circuit.
• Added GetOpenWIPTransferLineQtyBase summing open (unposted, non-return) WIP transfer-line base qty.
• CheckCreateWIPTransfer returns true when posted + open < expected. HandleWIPTransferForPurchLine cap subtracts posted and open qty, inserting only the remainder.

Test

WIPTransferRemainderCreatedWhenOpenLineQuantityReduced reproduces the scenario.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

Fixes AB#639382

[github-actions]

Copilot PR Review

Iteration 3 · Outcome: completed

Knowledge source: https://github.com/microsoft/BCQuality@822cae1b2771ac25f665f73369f69093bd4fd630

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