Getting an Unexpected critical error trying to Update an Item

Hi,

I'm having issues with `.Ipp.Exception.IdsException: Validation Exception was thrown.Details:Business Validation Error: Unexpected critical error. (-20996).` when trying to update an Item. There was no other detail on the exception except it's a Bad Request.

Library version: 14.6.4

**Sample request**
```
{
"Name": "{the-item-name}",
"Sku": null,
"Description": null,
"Active": false,
"ParentRef": null,
"FullyQualifiedName": null,
"Type": 8,
"PaymentMethodRef": null,
"UOMSetRef": null,
"IncomeAccountRef": {
"name": "Sales Inside",
"type": null,
"Value": "{income-account-ref-id}"
},
"PurchaseDesc": null,
"ExpenseAccountRef": null,
"COGSAccountRef": null,
"AssetAccountRef": null,
"PrefVendorRef": null,
"ManPartNum": null,
"DepositToAccountRef": null,
"SalesTaxCodeRef": null,
"PurchaseTaxCodeRef": null,
"ItemGroupDetail": null,
"ItemAssemblyDetail": null,
"ServiceType": null,
"ItemCategoryType": "Inventory",
"ItemEx": null,
"TaxClassificationRef": null,
"UQCDisplayText": null,
"UQCId": null,
"ClassRef": null,
"Id": "{quickbooks-id}",
"SyncToken": "0",
"MetaData": null,
"CustomField": null,
"AttachableRef": null,
"domain": null,
"NameAndId": null,
"Overview": null,
"HeaderLite": null,
"HeaderFull": null
}
```

I'm lost on how to further debug.
Any help is greatly appreciated. Thanks