DDDEF entry

         (1)                                             
>>-+-ADD-----+--DDDEF(name)--+--------------------+--•---------><
   +-DEL-----+               |         .-,----.   |      
   '-REP-----'               |         V      |   |      
                             '-CONCAT(---name-+-)-'      

1. You cannot use ADD to add a subentry value to the CONCAT subentry. You must use REP to replace all the old values with the desired new values.