Why do some lines work with nested copy (nc) and other don't?

[RobertEVs]

Using nc > escape on xref linework will typically bring in any line I need but at times it won't copy it. I checked the xref file and nothing weird or locked with any of the lines. In fact, Im trying to NC two centerlines that are both identical and on the same layer. One copies the other will not.

Anyone know the reason for this?

[cwitzel5NL5H]

I have seen this if the layer that the object exists on in the xref also exists in the new drawing and is turned off or frozen.

If it is an alignment, there is a tool in the SHP  Import/Export Utilities that will allow ncopy of civil objects.