When you "Correct" or "Cancel" a Posted Purchase Invoice, the Credit Memo that is posted takes the unposted Cr. Memo No. Series that is created behind the scenes and populates that in the Vendor Cr. Memo No. field of the posted Credit Memo. We would like it so it takes the Vendor Invoice No./External Doc No. from the Posted Purchase Invoice and populates that in Vendor Cr. Memo No. field. This will ensure the External Doc No. matches between the Invoice and Credit Memo in both the Vendor Ledger Entries and the GL Entries.

This functionality already works when you use "Create Corrective Credit Memo." When I use that, it opens up the Credit Memo and the Vendor Invoice No. populates into the Vendor Cr. Memo No. field. However, when using "Correct" or "Cancel" where the Credit Memo is automatically posted, it works differently.