Is this a typo in the question or does it mimic a typo in your system -
Parameter 'Software Application - 1': Expected 1 selected item for validation list EPS_SoftwareOnCategoryAndAmnufacturer, but got 0
This is a typo in our system
Just a thought. Hopefully someone else can shed some light
I am curious, is one of your fields being fed a default value? I seem to recall having this same issue and it was being caused by a default value. You can see the value, but the system isn't sensing that a value is present. It also works fine when you select the value manually because it is then sensing the presence of the value.
I will dig back through my notes tomorrow to see if I can find more information.