Infopath: combobox and dropdown disabled when used in SharePoint 2010 Custom Task From for VS Workflow

Question

I'm trying to add combobox filled form secondary data connection (SOAP service) to Custom Infopath Task Form. Everything works ok in Preview but when I deploy Workflow on SP my combobox is disabled?

Data connections files are centrally managed on SP.

I've even tried to enter choices manually in combobox properties but still when I publish form this combo (or dropdown) is disabled?

Answer 1

I managed to resolve this issue by applaying steps from here and setting new fields to default values in Workflow code (Wf serializes form data).