Unable to delete workspace when using Oracle database

Description of problem:
When you use Orace as an underlying datasource, the application shows Unexpected error dialog (java.sql.SQLSyntaxErrorException: ORA-00932: inconsistent datatypes: expected - got BLOB) when you try to delete a workspace.

Version-Release number of selected component (if applicable):
BPMS 6.0.0 ER2 deployed on EAP 6.1; EAP configured to use Oracle version 11g R2 as a datasource.

How reproducible:
Always

Steps to Reproduce:
1. Configure EAP to use Oracle 11g R2 as datasource for dashbuilder
2. Login to dashbuilder application with root user
3. Select workspace Showcase and create duplicate of it using 'Duplicate workspace' button in the administrator bar.
4. Select duplicated workspace 'Copy of Showcase' and click 'Delete workspace' in the admin bar.

Actual results:
Unexpected error dialog appears displaying expection (see error log attached, search for UNEXPECTED ERROR), also the workspace is not deleted.

Expected results:
Deletion of workspace should be possible without exceptions

Additional info:
Marking this as test blocker, because our test suite relies heavily on Duplicate workspace functionality. To ensure test independence we must create and then delete workspaces. With this bug present we are unable to run more than 1/2 of our automated dashbuilder UI test suite.