Individual Payment/Grouped Payment 
Each open item must be paid individually because there is always one boleto per open item (except for debit notes with invoice reference).
However, for payment via DOC or OP (that is, without boletos), you may want to pay several items grouped together with one payment.
The Brazilian localization offers various possibilities to automatically cover this situation:
All items for this vendor/customer are always paid individually regardless of any further specifications.
The payment method is not explicitly entered into the open item.
- You enter the barcode number -> Individual payment
- You do not enter the barcode number -> No individual payment
Payment method is flagged Single payment for marked item. -> Individual payment
Payment method is not flagged 'Single payment for marked item'. -> No individual payment