Hi Vishal,

Most likely you cannot modify dimension text by double-clicking on it because of the incorrect PICKFIRST System variable value.

Try to set it to 1. At the command prompt type PICKFIRST, hit Return, then type 1 and hit return again:

Command: PICKFIRST
Enter new value for PICKFIRST <0>: 1
Command:

Now try to edit dim text by double-clicking on it.

Maxim