Books API Receiving an Error that Doesn't Make Sense when Creating Credit Note - trying to use 'ignore_auto_number_generation' argument

Books API Receiving an Error that Doesn't Make Sense when Creating Credit Note - trying to use 'ignore_auto_number_generation' argument

Hello,

I'm working on a newly created routine and I'm getting an error that doesn't make sense when trying to create a new Credit Note.

Here is my POST request.

Endpoint:   https://www.zohoapis.com/books/v3/creditnotes?organization_id=##########

Body:
    {
    "customer_id": "3853445000000088169",
    "date" : "2025-10-22",
    "creditnote_number": "VRBO_458657_HA-FFDB0X_REFUND",
    "ignore_auto_number_generation": true,
    "line_items" : [
        {
            "invoice_id": "3853445000011912001",
            "item_id": "3853445000008744186",
            "rate": 734.75
        }
    }


My authentication is good because this request is successful if I remove the 'creditnote_number' and 'ignore_auto_number_generation' arguments.

This request gets the following 400 error response:    {"code":8,"message":"Invalid Element ignore_auto_number_generation"} 

But the documentation says otherwise on this page. 'ignore_auto_number_generation' is a valid argument. https://www.zoho.com/books/api/v3/credit-notes/#create-a-credit-note-ignore_auto_number_generation

If I remove the 'ignore_auto_number_generation' argument, I get an error that says I need to disable Auto Number Generation.
    {"code":4097,"message":"Number entered does not match the auto-generated number. To proceed, please disable auto-generation and continue."}


And again, this request is successful IF I remove the 'ignore_auto_number_generation' and 'creditnote_number' arguments. However, I need to use a custom name for my credit notes so I don't know what I'm missing.

Anyone see what I'm missing? I don't see any other arguments that would be required.

Thanks for your help.

john