Can't change dimension.

[Anonymous]

For example if  I it try to change this value "2126" it give me this error.

One more problem is that the dimension isn't changing to one that I wrote,for some reason if a type 800 it changes to 1387.4

[aRcHiTeCt.JM]

.... it is probably because the dimension has been constrained

[ToanDN · Accepted solution]

Assign that dimension to a parameter, then change the value of the parameter.

[Corsten.Au]

HI

Check on other views..

Front Elevation

Back Elevation

and you may find that distance already locked and constraint..

Best luck.

[barthbradley]

UNPIN THE CENTERLINE.  

[barthbradley]

Did you even try unpinning the Centerline? 

The pin is the only thing preventing you from changing that dimension.  Or was the question how to add a label to a dimension?  

[barthbradley]

...have you tried changing the Dimension Style Font?