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Hi,
>> What's causing it
In the layout the dimension (with the correct dimension style setting) AutoCAD has to pick the objects in modelspace and then calculate the viewport scale to show the correct modelspace distance in paperspace. That's at least how it's working .. your current space is paperspace, you pick points using object snap for objects ==> AutoCAD looks to geometry at the objectsnap point and if it finds objects in modelspace then the dimension value shown is the distance in modelspace.
However, when you use the object snap, e.g. endpoint, and AutoCAD finds no entities it shows the distance in the paperspace (no calculation of viewport's scalefactor is then used to display the dimension value. Other situation: when AutoCAD finds entities in paperspace at the object snap point ==> AutoCAD will show the dimension value for paperspace too.
...and that seems to be your situation: The first dimension was used with object snap on modelspace entities ... but the second dimension was done with objectsnap ==> and this objectsnap found the previous dimension entity, which is a paperspace entity, and so AutoCAD does not see the viewport and does not calculate the viewport scale for the dimension value.
I would suggest to be more careful about using objectsnap when creating dimensions, make sure AutoCAD does not see the other dimension, only the modelspace.
Look to that video showing the situation of using the incorrect object snap and so getting an incorrect value + the setting in AutoCAD to ignore dimension line extensions for objectsnaps.
Hope the description makes sense for you!
You might also look to >>>that thread<<<
- alfred -
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
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(not an Autodesk consultant)