Jan_Dittrich added a comment.
Good points.
But enabling it and "tricking" the user into clicking a dysfunctional button, just to show an error message, is worse I feel.
It would at least show the information the user needs to carry on. I suggested this because it matches the behavior when URLs
thiemowmde added a comment.
Having a disabled save button but no explanation why is bad. Fully agree. But enabling it and "tricking" the user into clicking a dysfunctional button, just to show an error message, is worse I feel. Same for saving dysfunctional values nobody else can later use or fix,
