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Add an Order if Document has it as basis or linked to some Order.
For example, Bank Payment as a payment document relates to some Purchase Order - in this case Order is required obligatory to fill:
5. Accounts Amount and Accounting Amount at Accounts Payable tab and Amount of Settlements and Accounting Amount in the Payee Attributes tab should match:
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6. As the Mutual Settlement document is posted, the corresponding record is created and documents are settled:
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