I would use a search help exit. Nothing WDA specific here, as this has been possible long before WDA came around. With a search help exit you define the search help like normal, but instead of database table or view being the source of selection, you have a function module. Within the coding of this function module you can call an RFC to read data from another system or call a web service if you need to bridge over to something that isn't ABAP based.
I have another question because I am a new entry on web dynpro. When I associated the search help on the field, on view of web dynpro the "Search Help Symbol" near the field appears automatically or I have to specify a property of inputfield?
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