There should be a link between field ' Dummy KPI' from the primary data source to 'Linking field' from the secondary data source to blend.
In 2019.1, somehow when I refresh the extracts, the link will break my view. Once I unlink the field 'Linking field' (thus no relationship anymore) , my previous blending view appears...
Just to confirm, did this work ok for you previously with an earlier release? (say 2018.3?)
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