Error on compile

I have written a program that will submit another rpgle sql program to batch 
mode.....however when I compile I am getting an error saying that the 
operands are not compatible with the type of operator....

Here is the relevant code:
DPARM1            S              2A                                    
DPARM2            S               D   DATFMT(*USA)                     
DPARM3            S               D   DATFMT(*USA)                     
DCMD              S            200A                                    
 **********************************************************************
 *       MAINLINE                                                      
 **********************************************************************
C                   EXFMT     MAIN                                     
C                   IF        *IN12 = *ON                              
C                   EVAL      *INLR = *ON                              
C                   RETURN                                             
C                   ELSE                                               
C                   MOVE      DBRANCH       PARM1                      
C                   MOVE      DSTARTDATE    PARM2                      
C                   MOVE      DENDDATE      PARM3                      
C                   EVAL      CMD = 'SBMJOB CMD(CALL PGM(INVMARGIN) ' +
C                             'PARM("' + PARM1 + '" ' +                
C                             '"' + PARM2 + '" ' + 
C                             '"' + PARM3 + '"))'  

The errors refer to PARM2 and PARM3 specifically.  Any suggestions would be 
appreciated.  I have tried everything from the ampersand ( & ) to the plus I 
am now using and nothing seems to make a difference.



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