[REST] InvoiceItems have TaxationItems, adjust invoice-item SourceType:"Tax"
When performing IIA's to write off invoices, some of the invoices were not zeroed out due to some of the items having TaxationItems associated with it.
If you would like to get the info about Taxation Item, you may use POST query (https://www.zuora.com/developer/api-reference/#operation/Action_POSTquery) call to query TaxationItem (https://knowledgecenter.zuora.com/DC_Developers/G_SOAP_API/E1_SOAP_API_Object_Reference/TaxationItem) object.
You may use POST create call to create Invoice Item Adjustments.
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