Issue in Refund Flow for Approved Invoices

[lizhuomeng71]

Summary: A new issue was found in the refund flow. When an invoice is approved and the invoice reference has a pending credit invoice link, an error message occurs.

Steps to Reproduce:

Use an EFT-enabled account.
Create an invoice and run ./create_cfs_invoices.sh.
Generate a statement ensuring there are at least two invoices included.
Link this statement to a short name.
Click on "Apply Payment."
Before 6 PM or before running ./run_eft_task.sh, request a refund for one of the invoices.
Now, run ./run_eft_task.sh.
Actual Result: Both invoices are charged, but the invoice with the refund request remains stuck at the "Refund Requested" stage.