Prep type malling issues for clothing, grocery, figurines

[travisrr]

I'm encountering consistent "prep_type" errors when attempting to list both clothing and figurine products via the SP-API.

Here are some of the sample ASINs I'm working with:

Clothing: B0BKTLG9PR, B0BKTK6ZRT, B0BKTK5CQP
Figurines: B082YMF6NC, B0BMXZY22W
Grocery: B00KQ1A63E

I've consulted the SP-API documentation, but I'm still unclear on the specific prep_type values that are valid for these product categories. I've tried common prep types like "polybagging," "bagging," and "boxing," ensuring correct casing and format, but I continue to receive errors.

My Questions:

Category-Specific Prep Types: Could someone provide a definitive list of acceptable prep_type values for clothing and figurines? A comprehensive mapping of product categories to allowed prep types would be incredibly helpful.

Multiple Prep Types: Is it possible that these items require multiple prep types? If so, how should I format the prep_instructions array in the request body?

ASIN-Specific Guidance: Are there any known prep type requirements or nuances for the specific ASINs I listed?

Error Details:

ERROR: Prep category and types cannot be updated for msku _______________ with existing prep category of FC-PROVIDED.

Request:

Ideally, it would be fantastic if Amazon could provide a comprehensive product category/prep-type mapping chart within the SP-API documentation. This would significantly reduce confusion and streamline the listing process.

Any guidance or insights would be greatly appreciated