Create a dimension and drag it to the hatched surface.
Activate the Hatch (double-click) and click the
Text Island button 
.
Click the dimension and exit.
It is possible to create an island around a text box or dimension placed on a hatched surface. This allows you to see the entity more clearly:
Create a dimension and drag it to the hatched surface.
Activate the Hatch (double-click) and click the
Text Island button .
Click the dimension and exit.
A non-hatched island created around the dimension:
