This setting is relevant for Xero Purchase Order and Bill workflows.
This is how you set up Purchase Order matching:
Find your Organisation in the main menu and go to Approval workflows under Workflows and settings.
Open the respective workflow, click on the Gear icon:
Within the Matching section, navigate to the Purchase Order Matching setting and select your preferred options.
For details, please refer to this section in our Knowledge Base.
Apply your settings by clicking on SAVE CHANGES in the upper right-hand corner of the Workflow Settings window and update/activate the workflow.