I need to store a number in CDT field but it is giving 2147483647. Can you pleas

All limits are described at forum.appian.com/.../Appian_Data_Types.html

For Decimal, since we use double precision floating point, you can review en.wikipedia.org/.../Double-precision_floating-point_format for more information.

Just out of curiosity. Are process ids stored as integers or decimals whithin Appian? What happens once the number range of one engine starts to get into the one of another engine? TIA, Moritz

There's no overlap of process id's. Each engine has a range of id's with a different starting point.

They are integers both positive and negative.