How to stop paying a vendor invoice twice in Sage 300

Duplicate payment is when the same supplier invoice is entered or paid more than once. It often happens when an invoice arrives by two routes.

Before you start

Where to find it: Accounts Payable > A/P Setup > Vendor Groups / Vendors

On the vendor group (and vendor) choose whether to check for duplicate invoices.
The check can use same vendor and amount, or same vendor and date.
You cannot make a change that would create duplicate document numbers for the same vendor.

The check is vendor with amount or date, not an exact invoice number test across vendors.

Forward the supplier's invoice to Pulsify.
Pulsify compares the invoice number with punctuation and case ignored, plus the same vendor, invoice date or tax ID.
It checks other Pulsify documents and active bills in Sage 300.
A possible duplicate is flagged. Open the match, then reject or approve anyway.

Pulsify connects to Sage 300. We set up the connection for you.

What Pulsify does not do here

Leaving the duplicate check off on the vendor group.
Relying on it for an invoice that was re-keyed with a different date and amount.

Last checked 2026-10-19. Confidence: partial.

On the vendor group and the vendor you choose whether to check. The check can use same vendor and amount, or same vendor and date.

No. You cannot make a change that would create duplicate document numbers for the same vendor.

No. The check is vendor with amount or date, not an exact invoice number test across vendors.

The invoice number with punctuation and case ignored, plus the same supplier, invoice date or tax ID.

Want this done for you?

Book a call to see how Pulsify handles supplier bills in Sage 300.