S/36 to AS/400 Logical File Problem

I am working on converting programs from a S/36 (CBL36) mode to a AS400 (CBL) 
mode.  I've run into something that I have not been able to figure out.  
Hopefully someone can help me. 

On the S/36 I have got logical files but off the physical file with multiple 
keys.  I cannot compile these on the AS400.  I am REALLY stumped on this one.  
What do you do to convert logical files (COBOL wise) from the System/36 to the 
AS400.

                               Start   Len
CUST-NUMBER       1       6     (Key to the Physical File)
CUST-TYPE             7       1
CUST-NAME            8       30

        I have a logical file set up by name, type and then number.   My file 
definition in COBOL looks like this.

SELECT CUSTOMER-FILE    ASSIGN DATABASE-CUSTFILE
                                                ORGANIZATION INDEXED 
                                                ACCESS DYNAMIC 
                                                RECORD KEY IS CUST-NAME
                                                                             
CUST-TYPE
                                                                             
CUST-NUMBER

This will not compile using COBOL 400.  It tells me that I've got too many 
keys. 

Thanks so very much. Please send any responses to pcampbell@xxxxxxxxxxxx

Phil Campbell  :)