Building Materials: Attribute Migration Issues

Do not use the Purge Unused command unless you are confident that your project is not using any of the attributes to be purged.
If you are migrating multiple similar project files to ARCHICAD 20, the Replace Attributes by File function can help you speed up the migration process: it automates the Delete and Replace attributes function, instead of you having to issue repetitive “Delete and Replace” commands in each attribute settings dialog. This requires generation of a text file in a particular format, and running a command that calls this file.
Note: It is recommended that you do not change Building Material names in files that are to be used as or with hotlinks, until all of the participating files have been migrated. Such name changes should be made before the hotlinks are updated.
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