Each time you enter an invoice from a specific contractor, the invoice number is recorded in our system.
If you try to enter the same invoice twice, the system will alert you that this invoice has already been added (to prevent double entry).

However, if it is a combined invoice for multiple services, you may need to enter the same invoice number multiple times (i.e. to record services of one contractor for different properties).
To record the same invoice multiple times select the "Multiple Invoice" check box on the "Add Invoice screen".
This will allow you to enter the same invoice number multiple times.
