This error occurs when one or more expenses on the specified report has been marked "billable", which requires a customer to associate with the expense. Customers must be set up in Xero and pulled over from Xero.
The solution to this error is to navigate to your Admin tab> Policies > [Select Policy] > Connections > “Configure” and then select the Coding tab and make sure to enable your "Billable Expenses".
Customers will then appear on the Expense edit screen to apply any billable expenses to:
Once you have enabled the Billable Expenses export, you will need to select a customer for each billable expense. You will then be able to export this report to Xero.
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