Signed Numeric (S): Only numbers 0 through 9 and '-' are allowed.
Numeric shift (N) and Numeric Only (Y): WebFacing ignores leading and trailing spaces but allows embedded spaces. We allow for +/- signs before and after the numbers, any spaces embedded between the numbers, and the + or - signs being treated as trailing spaces. We deviate from 5250 behavior when displaying the data. For example, a field with value -5 (length 4 and 0 decimal position) will be shown as -0005 instead of 000N.