DSIYV04 UEICKSUM UEI CHECK (4700)    REMOTE PROCEDURE (8994)

RPC: DSIYV04 UEICHK UEI CHECK - Check or create the UEI check digit
          check digit if DSIYC=2
 
 Input: DSIYX - UEI as passed
        DSIYC - (optional) 
             applies only if 11 char passed. 1 or 2 calculate check digit,
                2 then return only the check digit only, 
                1 updated UEI with check digit and return 12 char UEI.
 
 Return:  12 char UEI or -1^message

• DSIYX
  PARAMETER TYPE:   LITERAL
  MAXIMUM DATA LENGTH:   12
  SEQUENCE NUMBER:   1
  DESCRIPTION:   

  DSIYX - 12 character UEI Number or 11 character when the 2nd parameter 
          DSIYC is passed to calculate the check digit.
  

• DSIYC
  PARAMETER TYPE:   LITERAL
  MAXIMUM DATA LENGTH:   1
  SEQUENCE NUMBER:   2
  DESCRIPTION:   

  DSIYC - optional.  Pass 1 to calculate the check digit and pass back the 
          12 character UEI.  Pass 2 to return only the check digit.