Why SQL0080 when using GENERAL?

The SQL manual states:

GENERAL
    A general call to the procedure is performed.  
Additional arguments are not passed for indicator 
variables.

So how come when I
 CREATE PROCEDURE ROB/ROBPROC3
   (OUT StrSize DEC (5 , 0), OUT StrReturned CHAR ( 500)) 
   LANGUAGE RPGLE 
   NOT DETERMINISTIC 
   NO SQL   
   EXTERNAL NAME ROB/PROC 
   PARAMETER STYLE GENERAL

and then use:
C/EXEC SQL                                  
C+ CALL ROB/ROBPROC3 (:StrSize :StrReturned)
C/END-EXEC                                  

My compile bombs with:
  918        C+ CALL ROB/ROBPROC3 (:StrSize :StrReturned)                    
MSG ID  SEV  RECORD  TEXT                                                    
SQL0080  35     918  Position 38 Indicator variable STRRETURNED not SMALLINT 
                     type.                                                   


I thought PARAMETER STYLE GENERAL got rid of the need 
for the indicator variables?


DSPMSGD RANGE(SQL0080) MSGF(QSQLMSG)
Message ID . . . . . . . . . :   SQL0080                                     
Message file . . . . . . . . :   QSQLMSG                                     
  Library  . . . . . . . . . :     QSYS                                      
                                                                             
Message . . . . :   Indicator variable &1 not SMALLINT type.                 
Cause . . . . . :   The definition of indicator variable &1 must be a 2-byte 
  binary with a zero scale.                                                  
Recovery  . . . :   Specify an indicator variable that is defined as a 2-byte
  binary with a zero scale.  Try the request again.                          
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