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Steps to perform to set it up:
Step 1 - Identify your source object. Does this object has lines?
Step 2 - On TwixRiva Xero Invoice object, create a lookup field to your source object.
Note: if you already have a lookup as part of the ‘Pre-Fill your Invoice’ guide, you can reuse this one.
Step 3 - Create a new record in the Xero AutoCreate Mapping Custom Metadata Types.(Gear Icon on the right>Setup> Search Custom Metadata in the Quick Find Box on the left>Click on Custom Metadata Types>Manage Records Next to Xero Auto Create