BigQuery - Transactions in internal promo report - sql

Question

like in the question here (Replicate Internal Promotion report in BigQuery with transactions) I want to rebuild the internal promo report from Google Analytics.
I was able to get PromoViews and PromoClicks, but I don't get the transactions...
My query looks like this
SELECT
clientid,
fullvisitorid,
visitstarttime,
concat(fullvisitorid, cast(visitstarttime AS string)) AS sessionid,
hp.promoid,
hp.promoname,
hp.promocreative
hp.promoposition,
promotionActionInfo.promoIsView as promoview,
promotionActionInfo.promoIsClick as promoclick
FROM [MYDATA], UNNEST (hits) as h, UNNEST (h.promotion) as hp
When I sum promoview and promoclick I get the exact same results like in Google Analytics
The official Google Documentation says:
>How transactions are attributed
>The Internal Promotion report attributes transactions to either an internal-promotion click or >internal-promotion view.
>
>Each hit in an ecommerce session can have:
>
>0 or 1 internal-promotion clicks
>0 or more internal-promotion views
>Internal-promotion click attribution
>If a hit includes a single internal-promotion click, then that internal-promotion is credited >for the transaction.
>
>If a session includes multiple internal-promotion clicks, then the last-clicked internal->promotion is credited for the transaction.
>
>If a hit includes zero internal-promotions clicks but one of that user’s previous hits does >include an internal-promotion click, then the internal promotion from the previous click is >credited for the transaction.
>
>Internal-promotion view attribution
>If none of the conditions above is true but a hit includes one or more internal-promotion >views, then the transaction is credited to all promotional views within the session.
https://support.google.com/analytics/answer/6014872?hl=en
Keeping this in mind, my approach was to do a join with a separate table where I query the enhanced ecommerce data using sessionid as the join key
SELECT
clientid,
fullvisitorid,
visitstarttime,
concat(fullvisitorid, cast(visitstarttime AS string)) AS sessionid,
hp.v2ProductName AS ProductName,
h.transaction.transactionId AS TransactionId,
hp.productQuantity as Quantity,
FROM [MYDATA], UNNEST (hits) AS h, UNNEST (h.product) as hp
WHERE
h.eCommerceAction.action_type = "6" AND
(hp.isImpression IS NULL) AND
(
(h.promotionActionInfo.promoIsView is true) OR
(h.promotionActionInfo.promoIsClick is true)
)
But it seems that my WHERE clause (filtering the promoviews and clicks) is not working like I expect, because I receive an empty table as a result.
Can anybody help me with this?