SAP ABAP Message Class MX Message Number 020 (Group & was not yet defined -> insertion not possible)
Hierarchy
SAP_BASIS (Software Component) SAP Basis Component
   BC-DWB-DIC-AC (Application Component) Activation Program, Conversion Program, DB Utility, MC, SPDD
     SDTB (Package) ABAP/4 Dictionary: Tables
Attribute
Message class MX  
Short Description Messages for table multiplexing    
Message Number 020  
Documentation status      
Authorization check Error Message      
Changed On    
Message Text
Group & was not yet defined -> insertion not possible
History
Last changed on/by 20141121  SAP 
SAP Release Created in