hooking the Ad Network + Google Analytics connector you receive a list of n fields. How to know the origin of each of these?
For example, how do I know if the keyword field refers to bing or adwords?
If they are not marked as from a specific source, then that field combines all data from all sources that support it. So for "keyword", the data can be sourced from any of the data sources. For example, with the "Data Source" field added to show where it came from:
I hope this helps.