This setting is relevant for Xero Purchase Order, Bill, AP/AR Credit Note and Sales Invoice workflows.
Organisation Administrators can allow (or restrict) adding the REJECTED prefix in the Reference field for documents originating from Xero.
This is how you allow adding the REJECTED prefix to Xero references:
Find your Organisation in the main menu and go to Approval workflows under Workflows and settings.
Open the respective workflow and click on the gear icon:
In the General section, navigate to the setting for Add the REJECTED Prefix to Xero References and select "Yes, add the prefix".
Please note: The default value is "No, do not add the prefix"
Apply your settings by clicking on SAVE CHANGES in the upper right-hand corner of the Workflow Settings window and update/activate the workflow.