AutoCAD - Show real scale or print scale dimensions in Paper Space

If you ever want to check what the dimension of an object is going to be when it's printed on a particular scale you set(in layout/paper space), you have to set DIMASSOC values to either 0 or 1. If the value is set to 2, the dimensions display the real scale dimensions of the object in paper space.

Please refer the following link from cad-notes for a detailed explanation.