I_SAVE = 'X' --> Standard save mode
Display variants can be saved as standard display variants.
Saving display variants as user-specific is not possible.
I_SAVE = 'U' --> User-specific save mode
Display variants can only be saved as user-specific.
I_SAVE = 'A' --> Standard and user-specific save mode
Display variants can be saved both as user-specific and as standard
variants. Users make their choice on the dialog box for saving the
display variant.