National decimal (external decimal) 
For signed numeric items described with usage NATIONAL, the SIGN IS SEPARATE clause must be specified or implied.
PICTURE Valid Range of Values
9999 0 through 9999
S99 -99 through +99
S999V9 -999.9 through +999.9
PPP999 0 through .000999
S999PPP -1000 through -999000 and
+1000 through +999000 or zero