Error: Invoices can only be paid by using the check writing process.

When Invoice adjustment hasn't been posted but payment is reconciled, change invoice status to Approved and get error: Invoices can only be paid by using the check writing process 
We are currently evaluating this issue and will update this article when we have more information.

Steps to Duplicate

1.  Open paid Invoice with Not Yet Posted adjustment
2. Change Invoice status from Pending to Approved > Save
3. Get error: Invoices can only be paid by using the check writing process

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