From a specific server, my Web Service can't return a boolean. For example:

FUNCTION MyFunc() AS String
RETURN ''
ENDFUNC

works.

However, the following:

FUNCTION MyFunc() AS Boolean
RETURN .F.
ENDFUNC

causes the Web Service to fail and returns a SOAP error on the client side.

This is the same code as I am using elsewhere. But, on that specific server, I can't have a method to return a boolean. Why is that?