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Name of affected component: Measurement Protocol

Issue summary:
Enhanced e-commerce transactions using the measurement protocol aren't processed when a userId is present.

Steps to reproduce issue:
1. Send POST data to https://www.google-analytics.com/collect as decribed here: https://developers.google.com/analytics/devguides/collection/protocol/v1/devguide?hl=nl#enhancedecom
2. The event is processed, the transaction is not.
3. When removing the uid from the POST-data and sending it again, the transaction will be processed and becomes visible in Google Analytics.

Expected output:
The transaction visible in both the user-ID property and the global property.

Actual results:
Only the event becomes visible when a userId is present.

Notes:
We both activated enhanced e-commerce and userID. In all other cases, hits with a userId (events, pageviews, ...) are processed like it should be. Accept for transactions.

We use PHP to do the task:

send(array(
        'v'     => '1',
        'tid'   => 'UA-2759391-3',
        'cid'   => '2011248066.1366974771',
        'uid'   => 'ABAE123',
        'dh'    => 'superstock.be',
        't'     => 'event',
        'ea'    => 'purchase',
        'ec'    => 'ecommerce',
        'el'    => 'purchase was made',
        'dp'    => '/purchase',

        'ti'    => '12',
        'tr'    => 2000,
        'ts'    => 10,
        'tt'    => 418,
        'cu'    => 'EUR',

        'pa'    => 'purchase',
        'pr1id' => '99',
        'pr1nm' => 'With User AND Payload AND Pageview',
        'pr1pr' => 199,
        'pr1qt' => 1
));

send with curl where the above array is the payload:
CURLOPT_POSTFIELDS  => utf8_encode(http_build_query($payload))