Do not create a formula field. Formula fields are (primarily) used to convert data for display or cculations.
The select expert is used to filter dat based on a boolean ananlysis of each row of data (TRUE keep, FALSE omit).
Hence why you get a boolean put into your dispaly on the report.
The Select Expert can be found by click on icon of the hand grabbing on red ball.
once you click on it click OK
then click ont he Show Formula
then click on the Formula editor
now but your boolean statement here
DateDiff ("d",{Command.INVDATE} , CurrentDate)>50
whnever a row is true it will staty in the report, flase gets kicked out
(kind of like the WHERE clause in a SQL statement)
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