A duplicate invoice check stops the same supplier bill being entered and paid twice.
What Sage 100 Contractor does on its own
No duplicate invoice number check was found in the Sage 100 Contractor help. The help says only that duplicate serial numbers are not checked. Staff look at the vendor history before entering an invoice.
- No duplicate invoice number check found.
What you need in Sage 100 Contractor
- Sage 100 Contractor Accounts Payable
Setting it up in Sage 100 Contractor
Where to find it: 4-2 Payable Invoices/Credits
- Print the Accounts Payable vendor reports and review the recent invoices for the vendor before you enter a new one.
- Open 4-2 Payable Invoices/Credits and type the Invoice# exactly as printed.
- Enter the Vendor, Job and dates.
- Compare against the vendor's invoice list for the same number or amount.
- Save only when it is not a repeat.
Good to know in Sage 100 Contractor
- Sage 100 Contractor does not check for duplicate entry of serial numbers on parts.
- Use the Status field to mark a questionable invoice 2-Review instead of paying it.
- Confirm in the product whether your version warns on a repeated invoice number.
What Pulsify adds
- Pulsify checks every invoice against earlier ones on invoice number plus supplier, tax ID or date.
- Bills keyed straight into Sage 100 Contractor count too.
- A file identical to one already uploaded is held. A person can process it anyway.
- A suspected duplicate asks the approver to confirm with Approve anyway.
Pulsify connects to Sage 100 Contractor. We set up the connection for you. More about duplicate invoice checks in Pulsify.
What Pulsify does not do
- Pulsify never matches duplicates on amount alone.
- A duplicate flag is a warning. The approver decides.
More help
- Duplicate invoice checks for Sage 300 CRE
- Invoice fraud checks for Sage 100 Contractor
- Line item coding for Sage 100 Contractor
- Multi-entity accounts payable for Sage 100 Contractor
- All Sage 100 Contractor how-to guides
Sources
Last checked 2026-10-19.
Common questions
Does Sage 100 Contractor warn about duplicate invoice numbers?
The Sage help describes no duplicate invoice number check. The help says only that duplicate serial numbers are not checked.
How can I catch a repeat invoice?
Review the vendor's recent invoices before entering a new one and compare invoice numbers and amounts. Mark a doubtful invoice 2-Review until cleared.
Can I mark a doubtful invoice so it is not paid?
Yes. Set its Status to 2-Review or 3-Dispute. This is a manual hold and does not compare invoice numbers.
Why do duplicates happen?
The same invoice arrives by email and post, a supplier resends it as a reminder, or two people enter it. A statement can also be keyed as a bill.
Pulsify setup guides
Want this done for you?
Book a call to see how Pulsify handles duplicate invoice checks in Sage 100 Contractor.