overlay(dsname:*NEXT) question?

Hi,


I will be retrieving web orders from a data queue.   Each order can have up to 
30 items in the cart.   Each  item will have detail information about the item. 
  A single detail or item has a max size of 61.    So 30 items x  length of 61 
= Max size of possible items in the cart 1830.  

We would like to retrieve the orders and place them in a data structure.  
Instead of creating a data structure with subfields to hold all the possible 30 
items in the cart.    I was trying the following  and recieved the message 
below for the highlighted areas.

D Detail          DS                                      
D   DtlFlds                     61    dim(30)             
D     DItmSku                 26                       overlay(DtlFlds)    
D     DItmErrCd                  2                 overlay(DtlFlds:*NEXT)
D    DDPCIDept                 4                 overlay(DtlFlds:*NEXT) 
D     DDPCIClass       4                overlay(DtlFlds:*NEXT) 
D     DDPCIItem         4              overlay(DtlFlds:*NEXT) 
D     DUntPrice           9            overlay(DtlFlds:*NEXT) 
D     DItmSkuSts         1             overlay(DtlFlds:*NEXT) 
D     DQtyAvlNow        3              overlay(DtlFlds:*NEXT) 
D     DExpShpDat        8              overlay(DtlFlds:*NEXT)     


Message ID . . . . . . :   RNF3468       Severity . . . . . . . :   20        
Message type . . . . . :   Diagnostic                                         
                                                                              
Message . . . . :   The second parameter for keyword OVERLAY is not valid;    
  parameter is ignored.                                                       
Cause . . . . . :   The second parameter for keyword OVERLAY (if specified)   
  must be a numeric literal with zero decimal positions or a constant name    
  that is previously defined as a numeric literal with zero decimal positions.
Recovery  . . . :   Correct the second parameter for keyword OVERLAY. Compile 
  again.                                                                      


Does anyone know why I would receive this message only after the second *NEXT 
and not the first two.  If I remove *NEXT and replace it with a numeric literal 
it works.  But that is not what I was looking for.  If you know of a work 
around or a better way to do this, please let me know.  


Thanks in advance for your help.

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