HI

I Have some AF Atributte that is a formula

I need to see the average in a month, catching day by day, from this AF Atributte

But when I apply, sometimes this error happen:"Unable to set the FormulaArray property of the range class"

Or sometimes

I have a similar example that works....

The "No good data for summary calculations" indicates there are no archive values for the formula to retrieve for the daily periods... You can check this by extracting compressed data on the source tags (A&B) to insure there is at least one value in the archive for each day... If A is a flag value then the data compression could go long periods of time without getting written to the archive. I am not sure how the formula handles this case.

rick