We have a temporary work object which presents the UI to  user to select previously created and decided cases(XYZ-123/XYZ-234/XYZ-345) in the system. Once the user selects a case(XYZ-123), system lets the user create secondary reviews for that case(ABC-123). This temporary work object design is working fine when the user is creating the case from Customer Service Portal. The same flow we are invoking from Interaction Portal, when we enter data on first screen and submit, system is creating 2 assignments -first one is the actual assignment which is meant for to be, second one is an empty assignment.