Try a formula that looks something like this:
StringVar result := "";
NumberVar i := 1;
While i <= uBound({?Parameter})
(
result := result + ToText({?Parameter}[i]) + ",";
i := i + 1;
)
If Length(result) > 0 then
Left(result, Length(result) - 1)
else
result
You may have to tweak the formatting in the call to ToText() - you can look that up in the Help in Crystal.
-Dell