Hi Djordje,
I believe you'll get a response from Support on the created case soon and will appreciate if you let us know the final result here. I love web services testing functionality in TestComplete, like to test web services and had several interesting successful projects with them and this is the reason of why I am interested in this problem.
The only thought I have now, is do you know if there is some standard that specifies how doubles can be converted to strings? The idea is that if scientific notation is allowed for the string representation of double, then I would say that, generally speaking, TestComplete behaves correctly (though maybe in an unexpected manner) and the problem is with the web service been not able to convert double presented in one of the possible string forms into native binary representation.
