When an invoice number is skipped or manually changed or even when two invoices are saved at the same second by different users the invoice numbers can conflict with each other.
This then causing the second invoice to display an error that the currently invoice number already exists. Users then manually change the invoice number to another number, causing a conflict with the next invoice number in line. On the Save event the system will only allow the invoice to save if the invoice number is unique, this is to avoid duplicate invoice numbers.
To fix this from happening on the next invoice generated, you need to correct the setting “Next Invoice Number”. This can be done with the following steps:
- Go to Admin
- Go to Company Settings
- Correct the “Next Invoice Number” to the next available invoice number.
- Click Save
Updated: 30 August 2021