Xero Error: Invoice not of valid status for modification

Issue

When syncing to Xero the error Invoice not of valid status for modification may occur.  

This error is caused when there is a duplicate invoice/bill number, or reference that already exists within Xero.

Xero matches on the invoice number, so this includes invoices that have been voided, deleted or paid in Xero (these are hidden from Xero's default list), invoices entered directly in Xero, and invoices brought across into Xero when moving from another accounting system (e.g. MYOB). If Tradify's next invoice number is lower than numbers already used in Xero, every new invoice will hit this error until the number sequence is moved past them.

Resolution

Reference Number:

1. Check the Reference number in Xero to see if an existing Invoice/Bill already uses this Reference number
2. If so, Update the reference number in your Tradify Invoice to something unique

Bills:

1. Check Xero if a Bill has the same number (Check for voided bills also).
2. If so, reset the bill to draft, and update the ref./Invoice no. to something new/unique.
3. Then approve and send to Xero.

Invoices:

1. Check in Xero if an Invoice has the same number: go to Business > Invoices > All, tick Include deleted & voided, and search for the number. Make sure you are looking at the Xero organisation connected to Tradify.
2. If so, Update your next number sequence to your next unique number (higher than any invoice number already in Xero, including voided and deleted ones)
3. Use the Copy Invoice from the Options menu to create a new invoice with a unique number
4. Consider changing your Xero integration settings to use Xero numbering sequence to avoid the same issue in the future.  

Additional Information

See this page on how to update your Xero integration settings: How To Integrate Your Tradify Account With Xero