updatePurchaseOrderAttribute

mutation UpdatePurchaseOrderAttribute($input: UpdatePurchaseOrderAttributeInput!) {
  updatePurchaseOrderAttribute(input: $input) {
    purchaseOrderAttribute {
      Created
      Etag
      LastSessionId
      Updated
      _IonValueCount
      _ValueCount
    }
  }
}

{
  "input": {
    "etag": "string",
    "key": "string",
    "purchaseOrderId": 1
  }
}

{
  "data": {
    "updatePurchaseOrderAttribute": {
      "purchaseOrderAttribute": {
        "Created": "value",
        "Etag": "string",
        "LastSessionId": "string",
        "Updated": "value",
        "_IonValueCount": 1,
        "_ValueCount": 1
      }
    }
  }
}