Why am I not able to add a secondary category?

I specify both primary category and secondary category in the AddItem request. However only primary category is getting added. Why?

Some categories are designated as "Value Categories". Items in value categories can only be listed in one category.

For example, if you attempt to list in two categories and the PrimaryCategory or SecondaryCategory is a value category, then eBay drops the SecondaryCategory and lists the item in the PrimaryCategory only. Similarly, if you attempt to add a secondary category to an existing listing, or you change the category for an existing listing, and if the primary or secondary category is a value category, then eBay drops the secondary category.

To check if a category is a Value Category, call GetCategoryFeatures. If <ValueCategory> returned in the response is true, that means that particular category is a Value Category.

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