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Hi everyone,
I'm running into a power bi dataflow refresh issue: Operand data type NULL is invalid for sum operator.
i think this issue may link to a groupby step in the flow for several decimal columns with null values included.
it looks fine when i finish the groupby and save the flow. but such error blocks me from refrehsing the dataflow.
Could you pls help advise the real reason? thank you.
in power query change null to 0
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