ByLayer Values in Objects in External References

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There is a bug in the 2018 release of
AutoCAD® Architecture and
AutoCAD® MEP that affects how the
“ByLayer” property value of an AEC object in an external
reference is being resolved. If a component is assigned to Layer
0 and then the Color, Linetype, Lineweight, Plot Style, etc. is
set to ByLayer, the value assigned to the layer of the parent AEC
object should be assigned. When the object is directly in the
current file, that works. But if that file is externally
referenced into another file, the property value of the layer of
the external reference is assigned, rather than the property
value of the layer of the parent AEC object. In the image below,
the left side shows a Door that has been placed on a layer called
A-Door-Demo. The visible components are assigned to Layer 0, with
ByLayer Color and Linetype. Layer A-Door-Demo has Color set to 32
and Linetype set to HIDDEN2. On the right side, that file has
been externally referenced into another file, and placed on a
layer called A-Anno-Refr, which is set to Color 212 and Linetype
Continuous. As you can see, the Door components have picked up
the Color and Linetype from the layer on which the external
reference is placed, not from the layer of the parent Door
object.

The suggested workaround, changing “ByLayer” to “ByBlock”
works, but would be a major undertaking if you have many
components assigned to Layer 0 with ByLayer attributes. We will
hold off on deploying 2018 until this is fixed.

As noted in
this Autodesk Knowledge Network article
, Autodesk is aware
of the problem and working on a fix. Keep an eye on that
article; I suspect that when a fix is released, the article
will be updated to reflect that.

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