Xero Tracking Codes for invoice line items

I am trying to update a Sales invoice in Xero - the invoice was created using data from Monday.com in the first place. I have no problems mapping item lines using the iterator / aggregator. Where it fails is when I want to amend or send the Tracking items in the line item. Whatever I send it just cannot read it. Essentially I want to grab the tracking data - amend it and then update the sales invoice.