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[hkillen]

In my Datamart, when attempting to 'Load Data', I receive the error "An internal error happened due to failed runtime assertion:  Parameter 'transactionId' is not expected to be null'  HttpStatusCode  500.

I'm guessing a null value is discovered in a table / query I'm transforming.  None of my tables have 'transactionId' as a field.  I can't for the life of me find which Table / Query where this is happening.  Please help.  image belowerror message

[lbendlin]

This sounds more like an issue on the Datamart side  (note the 500 error message). Do you get the same issue when you use a dataflow?