I am trying to create a table maintenance generator from the maintenance view created for the standard table ADRC. I have all the key fields in the maintenance view (ZADRC) that is created for ADRC table. However when I create a table maintenance generator for the maintenance view(ZADRC). then the keyfield ADDRNUMBER is not displayed in the output. what could be the reason behind this problem. However when I use some other standard table like LIPS then all the keyfield are displayed. Why there is a problem when dealing with ADRC table?