Including device type in PRODUCT_PARTITION_REPORT results in less zero impression data?

Hello,

i have some issues with the PRODUCT_PARTITION_REPORT.

I want to get zero impression data for data splitted by device.
Knowing that i can not include statistic data like impressions and clicks, i just use 'attributes' (account, campaign, adgroup, product_group and device).

I did 4 test queries - with and without device, with and without zero impressions. And then i recognized some major differences in the returned zero impression data:
Including the device type resulted in about 900 less(!) entries with zero impressions. Also whole campaigns with zero impressions are not returned anymore when device type is selected.

I did the same test with the KEYWORDS_PERFORMANCE_REPORT which was ok and i had no issues with it.

The full question/issue i have described on stack overflow:

http://stackoverflow.com/questions/28708378/adwords-api-campaignservice-query-returns-invalid-predicate-field-name-for-val?rq=1

So do you have an explanation for this behaviour or is it just a bug?

Thanks,
Mario

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