Im trying to set specific format for Start Time Column at the process report and data does not show when i set the format.
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The real answer here (as hinted by the documentation provided in Stefan's prior answer) is that the functions allowed within Process Report expressions are a very slim subset of all available functions - almost no newer ones, and nothing that uses keyword syntax in an input. You can call expression rules, but any rule you call has to abide by this constraint as well.