Issue with Incorrect Supplier Capture for IDR Invoices

Hello Experts,

We are currently facing an issue with IDR invoice processing. The system is not capturing the correct supplier and instead it is mapping the invoice to a different supplier.

As a workaround, while sending the invoice through Outlook, we included the subject line in the following format:
(61450-15873831) Invoice from Rona Inc.

In the first instance, the supplier was captured correctly. However, when we tried the same process a second time, the system again failed to capture the correct supplier name.

Could you please advise:

• Why the supplier mapping is inconsistent even when we follow the subject line format?