AWQL dateRange syntax problem

I get - 'syntax error, unexpected ',' - when trying to establish a custom date range in an AWQL query for a CRITERIA_PERFORMANCE_REPORT

My query ends with - DURING 20160716, 20160902 - as per the only documentation I could find showing actual syntax (I assume) - https://developers.google.com/adwords/api/docs/guides/reporting#custom_date_ranges - check AWQL tab in first code sample.

The query works fine with things like DURING YESTERDAY or DURING LAST_7_DAYS

Any help appreciated.

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