Maybe here is a (good / the only one / bad) solution, based on some hints in forums.
- Create a "Main"-ATTDEF; Option "invisible" (do be not displayed in drawing), but "Visibility state: always on" (to be displayed always in the dialogue)
- create 4 ATTDEF; prompt something like "don't touch - automatic filling"; "Visibility state" as you need, default as Textfield referenced to the value of the Main-ATTDEF
- make a block
The doubleclick on the block opens the dialogue to edit the attribs. You will see
- always the main attribute where you write your text
- one of the other ATTDEFs, depending on Visibility State, where you do nothing!
After ENTER nothing will happen, but REGEN will write the new value of main-attdef to all 4 referenced attdefs.
Maybe there is a better solution - comments are welcomed.