Concurrent Program Conditonal Dependant Parameter issue in Self Service

Hi Everyone,

We have a requirement to submit a concurrent program from Self Service Page where there is a conditional dependency between parameters.
Both have Value Sets attached.

Department:
Name:

The requirement is that if Department is selected, only names from that Department should show up in the Name LOV, else all Names should come in the Name LOV.

We coded this in the name parameter value set where condition as below.
DEPARTMENT = :$FLEX$.XX_DEPT_VS:NULL

It works if the concurrent program is submitted from PUI, but when submitting from Self Service, the selected value in Name parameter disappears every time we move to another parameter.