Convert YYYYMM date in to Mon-YY format.

Not sure, but you can try this-

=Month(Max(ToDate(FormatNumber([MonthID];"######"); "yyyyMM"))) + "  " + FormatNumber(Max(Year(ToDate(FormatNumber([MonthID];"######");"yyyyMM")));"####")

I had bit similar requirement, so worked on it. You can refer this-

Edit: You can remove Max from the code as it is not required in your case.
Updated one-

=Month(ToDate(FormatNumber([MonthID];"######"); "yyyyMM")) + "  " + FormatNumber(Year(ToDate(FormatNumber([MonthID];"######");"yyyyMM"));"####")

aniketp :uk: (BOB member since 2007-10-05)