If you see this error message while trying to edit or erase drawing objects, you are probably using a limited working set in the block/reference editor (the REFEDIT command).
First close the reference editor using the REFCLOSE command.
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FAQ
Featuring: Revit plugins for automating data management, opening creation for clashes, and documentation Be.Smart Core Collection
Please use these tips at your own risk. ARKANCE is not responsible for possible problems that may occur as a result of using any of these tips.