US-3.12wontfix Handle multiple transactions on the same account in one receipt
As a user who paid for part of a purchase with one card swipe and then a second card swipe on the same account (e.g. the first swipe failed and was retried for a different amount) I want know the correct workflow for this edge case so that both CSV debits are tracked without breaking the matching logic.
Acceptance Criteria
- The system raises a clear error if a receipt has two `AccountTransaction` entries referencing the same account, guiding the user to split the receipt into two labels.
- Currently raises `NotImplementedError("Did not yet support multiple transactions on single account for a receipt.")`.
No DAG diagram: WONTFIX — intentionally unsupported scenario; the workaround is to split into two separate receipts (each follows an existing DAG path).
Demo video coming soon