Quantity field not supported on pro-rated tax calls

Error Description

The Quantity field (qty) can’t be included on the line item (itms) if Proration (pror) is set..

Example

{
  "err": [
    {
      "code": -75,
      "msg": "Quantity field not supported on pro-rated tax calls"
    }
  ]
}

How to Resolve

Remove the Quantity field (qty) from the line item (itms) when running a Prorated (pror has a value set) line item (itms).

For more information, see Quantity and Proration.