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  Directive:    CHECKNUM
 
  Function:     Checks whether numeric fields contain valid data before
                performing operations on them.
 
  Syntax:
 
     ►►─┬───┬─┬────┬──CHECKNUM──────────────────►◄
        └─/─┘ └─NO─┘
 
 
  Parameters:   None
 
  Default:      NOCHECKNUM
 
  Phase:        Generate
 
  $SET:         Initial
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