feat: toggle updation of billed amount in previous purchase docs

[GursheenK]

Introduce the check to choose if the billed amount should be updated in the Purchase Order and Purchase Receipt when a Debit Note is created against the Purchase Invoice.

Case

• User creates a Purchase Receipt for an item with a Qty 10.
• User creates a Purchase Invoice against the PR with Qty 10. This leads to the billed amount in the PR to be 100%
• Now, suppose the user creates a Debit Note against the invoice with Qty -5, the status of the PR changes to partly billed and the billed amount becomes 50%.
• Then, the user creates a Purchase Return against the PR with Qty -5. In this case, the qty captured in the PR is 5 and the qty billed is also 5. But, the billed amount remains as 50% leaving the PR in Partly Billed status.

Since there is no specific order enforced for creation of Purchase Return before the Debit Note, the check can be used to handle cases when the billed amount should be / should not be changed in the previous doc.

no-docs