CISC vs RISC RPGLE

Over the weekend we implemented a new system.  This system was thoroughly
tested on a 320 CICS box 3.2...Sunday all the programs were moved over to a
640 RISC box 4.1.  One of the programs absolutely would not execute the
same.  Being sure it was a file problem much time was spent looking there.
Finally being exhausted a debug was setup.   The program is an RPGLE.  We
had to put a "key" on the second read to make it execute properly.  Is there
a list of differences between boxes or is it versions?    


0377.00 C                   IF        *IN(35) = *ON                      
0378.00 C                   READE(N)  ITRMREC                            
0379.00 C                   MOVE      TRAISLE       SaveAisle            
0380.00 C                                                                
0381.00 C*  Obtain Number of Pallets to Retrieve and to Store for Aisles 
0382.00 C                   DOW       *IN(34) = *OFF   AND               
0383.00 C                              SaveAisle = TRAISLE                
0384.00 C                   IF        TRCODE = 'R'                       
0385.00 C                   ADD       1             RtreveCnt            
0386.00 C                   ENDIF                                        
0387.00 C                   IF        TRCODE = 'I'                       
0388.00 C                   ADD       1             StoreCnt             
0389.00 C                   ENDIF                                        
0390.00 C     Saveaisle     READE(N)  ITRMREC                            
0391.00 C                   ENDDO                                        

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