Unable to edit conditions on User Defined Exception branches in TBUI
it is not possible to use User Defined Exceptions in TBUI. Page 83 of Siebel Business Process Framework: Task UI Guide indicates that the developer can choose from Error Exception or User Defined Exception, and then double-click on the connector to bring up the Compose Condition Criteria dialog box.
solution
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Use the below workaround. Refer Task UI: Conditions cannot be specified for User Defined Exception (Doc ID 873563.1)
Define the exception branch as a Condition, edit the conditions, and then change it back to User Defined Exception. This way it still permits the use of User Defined Exception in the Task.