What booking a receipt actually does

When the 3PL reports received quantities, the connector:

1. Creates the reverse transfer from the order's original delivery
2. the return receipt is linked to the outbound in Odoo's chain, so traceability survives.
3. Sets the receipt lines to what the warehouse actually counted (ActualReceived, not what was expected), with the batch numbers and expiries the 3PL reports. Lot-tracked goods reported without a batch fall back to the UNBATCHED lot with a logged warning.
4. Routes each line by its grade. The warehouse grades returned goods; the connector reads the grade/action and marks each RMA line Restockable or not - a grade or action containing one of the instance's Non-restockable Keywords (damage, dispose, scrap and so on; the list is editable, see Settings reference) marks the line non-restockable, and you can override the tick per line before processing. Restockable stock goes to normal sellable stock; non-restockable stock is received into the Damaged Returns Location (auto-created "Returns - Damaged" under the warehouse, or the location you configured) - so a write-off never pollutes sellable inventory.
5. Validates the receipt and moves the RMA to Booked into Odoo, with smart buttons to the receipt and the credit note.
6. Acknowledges the return to the 3PL (providers that support it - the 3PL's "set viewed") - only after Odoo has successfully booked it, so a crash can never leave a return marked processed at the warehouse but missing in Odoo.

The credit note

On booking, the connector raises a draft credit note for the received quantities, priced from the original order lines with their taxes - but only when it makes sense:

• only if the order has a posted customer invoice (nothing to credit otherwise - chatter says so);
• only if no credit note already exists for the order - whether raised manually by accounting or by an earlier return. The RMA's chatter names the existing one instead of duplicating it.

The credit note is always a draft: accounting reviews, adjusts if the refund policy says so (restocking fees, partial refunds), and posts. The connector never posts money movements by itself.