Library /sys$common/syshlp/BASICHELP.HLB  —  Compile time errors, ROUSUPDEC
  ERROR - Rounding was specified  for  a  non-DECIMAL  data  type  in  a
  compiler  command,  a qualifier to the BASIC DCL command, or an OPTION
  statement.  Specify rounding only for the DECIMAL data type.
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