The EDI 820 communicates payment instructions or remittance detail from the buyer to the supplier — how much is being paid, which invoices are settled, and any deductions being taken.
BPR
Financial Information — payment method (ACH, CHK), amount, bank routing
TRN
Trace Number — company ID, trace number, originating DFI
RMR
Remittance Accounts Receivable Open Item — invoice number, paid amount, adjustment
ADX
Adjustment — deduction reason code and amount
DTM
Date/Time Reference — payment date
Often sent alongside an ACH/EFT wire transfer. The supplier must apply deductions from ADX segments to the appropriate invoices in their AR system.
BPR02 (total payment amount) must equal the sum of all RMR06 amounts minus ADX02 adjustments. Mismatches cause payment application errors.