Without seeing the part itself it's anybodies guess why it doesn't work for you.
Clsoe SW down. Restart it and see if it still doesn't want to. Also double check that there still is a D3@Croquis5
Mr. Peter, I didn't write the "D3@Croquis5", I selected of my display.
I cant solved it...
right click> on equations in your tree
select> manage equations
any and all suspect entries
save and exit SW- and restart
re-edit/assign equations as required
just a guess- hope this helps
have a good'n kelef
PS- forgot to mention the obvious
delete dimensions not applicable of course
Reset SW options to show dimensions names (ID's). It may help to figure out what is wrong.