Inconsistency in ConstantDataService?

Hello,

I used the ConstantDataService to fetch all ProductBiddingCategoryData like in the examples from the googleads-api. But there is a difference between what I get there (Version 201509) and what I get in the AdWords Interface. When I target something that not exists in the AdWords UI I get an API Error. 

For Example (fetched from api):

Electronics > 3D Printers [212967353682838892]

Error type: CriterionError

Error String: CriterionError.INVALID_PRODUCT_BIDDING_CATEGORY

Field path: operations[4].operand.criterion.caseValue

Reason: INVALID_PRODUCT_BIDDING_CATEGORY

Trigger: ProductBiddingCategory{type=BIDDING_CATEGORY_L2, value=ProductCategoryId: 212967353682838892}

So, what's the Trick to find out what categories I can use?

Thanks in advance

Carsten

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