The ReIM operations guide indicaties that RWO records are written to IM_FINANCIALS_STAGE.

The point at which these write offs are actions is when open receipts are closed either in RMS or from ReIM.

It indicates the accounting records written are to debit unmatched receipts (UNR) and credit receipt write off (RWO) with value. It also writes a zero record to Trade Accounts Payalble (TAP). It does not indicate the full record that is written but possibly you can ask someone in IT to view that table after reimreceiptwriteoff batch has run and before any integration which passes that to finance.

Looking at the table constraints on IM_FINANCIAL_STAGE in the data model docs, at least one of the following ID fields needs to be provided

RECEIPT_ID, PARENT_ID or DOC_ID.

That should mean RECEIPT_ID is the shipment ID for the receipt write off - but this needs validating against data on a test system or production in between the batch and any integration jobs that transfer data to Financials.

See also

What are the Scenarios in Which IM_FINANCIALS_STAGE Table Gets Populated? (Doc ID 2160334.1)

FAQ: Receiptwriteoff Functionality (Doc ID 1543167.1)

According to the data model document, the same status of C for Closed is used for those posted to AP and those closed by the batch.

Status of the shipments invoice matching. Valid values are U for unmatched, P for partially matched, M for matched and C for closed (posted to AP or closed out by batch). This column will only be populated for PO shipments.

Doesnt directly answer the question but hope it helps.