Thank you Robert_L, Can you give me a bit of clarity on the 'Year'n value? I substituted the variables I use ('Term Year'n) and get the error(s) below. This is a character field. ( ParallelPeriod(_DistinctCount_, 'Student_ID'n, _ApplyAllFilters_, 'Term Year'n , _Inferred_, _Inferred_, 0, _Full_, {Date}) - ParallelPeriod(_DistinctCount_, 'Student_ID'n, _ApplyAllFilters_, 'Term Year'n, _Inferred_, _Inferred_, -1, _Full_, {Date}) ) / Abs(ParallelPeriod(_DistinctCount_, 'Student_ID'n, _ApplyAllFilters_, 'Term Year'n, _Inferred_, _Inferred_, -1, _Full_, {Date})) Invalid data item for this context: Term Year Invalid data item for this context: Term Year Invalid data item for this context: Term Year Thank you, Gary
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