How Discount Taken Cost Center segment pull the Project Cost Center Account of the AP invoice?

Summary:

When we process payment with discount, accounting entries is not generated due to the CVR. We have created a rule to pull the invoice liability account for payment but seems it is pulling the Cost Center Segment of the Invoice Liability from Common Options. Tried to pull the Cost Center from the Project DFF (for Cost Cost Center), it works however error is encountered for invoices with no Project details.

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