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It is possible to select multiple documents in a Mutual Settlement document in FirstBit ERP. On both the Accounts Payable and Accounts Receivable tabs, the "Pick" button opens a list of documents (such as invoices, payments, etc.) with amounts available for offsetting to select several documents for settlement at once. Alternatively, it is possible to add lines for each document by clicking the "Add" button and specifying the contract and particular document for each line. However, on the Payee Attributes of Mutual Settlement documents with Supplier Debt Assignment and Customer Debt Assignment types it is possible to choose only one payment document for settlement.
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