I have 2 different scenarios where i m unable to clean it. Details are in the attachment.
You need to search each bolean expression and delete it. Click on Home tab > search to Search for Bizagi objects such as entities, attributes, business rules and Processes. These are objects created by the users in the Process automation. For further information: http://help.bizagi.com/bpmsuite/en/index.html?bizagi_studio.htm
After you have deleted all bolean expressions, you will be able to delete the attribute from data model.
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