How can I add multiple payments to a purchase invoice?

You can record multiple payments with different payment methods and treasuries only while creating the purchase invoice by following these steps:

• When creating a purchase invoice, enable the “Already Paid to the Supplier” option.
• From the Payment Method dropdown select “Multiple”.
• Click Add to add a new payment row and repeat for each payment.
• For each row specify: the payment method, treasury or bank account, reference (optional), and amount.
• Make sure the total of all amounts equals the invoice total then click “Save“.

Note: The “Multiple” option is only available when creating the invoice. To add a payment after the invoice has been saved, use the “Add Payment” button from the invoice view page, which records a single payment at a time.

For more details refer to: Recording Multiple Payments When Creating a Purchase Invoice