Mark "Reportable as W1 on Activity Statement" via API
Payitems can be exported via API but marking them as "Reportable as W1 on Activity Statement" still has to be done in the web interface.
IsReportableAsW1 is now included on EarningsRates and IsExemptFromW1 is now included on DeductionTypes
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Alex Ghiculescu (Tanda) commented
PayItems can also be created through the API, the real issue is that this property can't be set when the pay item is created. This defeats the purpose of creating the pay item programmatically since the user still needs to log in to Xero afterwards and make edits.