Hello,
I am investigating payment application behavior in Dynamics 365 Business Central and would like to understand how "Apply to Oldest" determines which invoice receives a payment.
Customer setup:
- Application Method = Apply to Oldest
Open invoices before payment:
Invoice PSI-26-13827
- Posting Date: 7/28/2026
- Due Date: 8/27/2026
- Amount: 7,769.00
Invoice PSI-26-14110
- Posting Date: 8/11/2026
- Due Date: 8/11/2026
- Amount: 19,018.00
Test:
- Posted payment WT-10335 for $200 through Cash Receipt Journal
- Posted payment WT-10336 for $100 through Cash Receipt Journal
- No manual applies-to document was specified
Result:
- Both payments were automatically applied to invoice PSI-26-14110
- Invoice PSI-26-13827 remained open
- Detailed Customer Ledger Entries confirm WT-10335 and WT-10336 were applied to PSI-26-14110
Additional investigation:
- PSI-26-13827 has no application entries
- I reviewed one of our customization codeunits and found nothing affecting customer payment application logic
Question:
When Application Method = Apply to Oldest, what field does standard Business Central use to determine the oldest open invoice?
- Posting Date?
- Due Date?
- Entry No.?
- Another field?
In my example, the invoice selected by Business Central has a later Posting Date but an earlier Due Date, so I am trying to determine whether Due Date influences the automatic application logic.
Thank you.
