Product(s):	OpenBuildings Designer (and AECOsim Building Designer)
	Version(s):	CONNECT Edition and V8i
	Environment:	N/A
	Area:	Drawing Views
	Subarea:	Levels

Compressing a file during a session where Drawing Views are going to be created can result in incorrect results.

As described in Unwanted Levels in OpenBuildings Designer DGN Files and the linked items, OpenBuildings Designer copies required levels from the dataset into each file on open to support the creation of elements on those levels during Drawing View creation.

If a user runs a compress that includes the LEVELS and LEVELTABLES options these levels will be deleted and Drawing Views will be created with missing elements.

To avoid this:

Train users not to compress files during sessions where Drawing Views will be created.

If a file compress is run that includes the LEVELS and LEVELTABLES options just close and reopen the file (key-in 'newfile' is one quick way to do this), the levels will be copied in again.

The Compress options can be pre-set to avoid level deletion by adding the following statement in the site configuration:

MS_COMPRESS_OPTIONS = +ALL;-BUILDING_DATASET_ELEMENTS;-BUILDING_DISPLAY_ACCELERATORS;- LEVELS;- LEVELTABLES

Users can still override the settings but they will revert on the next file open