When design BDM, can't set 'Multiple' column for any attribute.
Even after import other BDM that designed on another machine, I couldn't see 'Multiple' column as designed before. This is not problem on Windows PC but happened on Ubuntu one.
Linux distribution : Ubuntu Desktop 16.04.4 LTS
Java : OpenJDK 1.8.0_162
1. on the studio, Development > Business Data Model > Manage
2. create a Business Object and an attribute
3. set this attribute to have 'Multiple' values