I believe that you have used the right code and configuration for your custom Data Service method.
How did you try to call your method?
Calling a method with float parameters can be a bit tricky but can be done using the following request pattern:
// provide all arguments for all parameters
// provide arguments for some parameters
The most important thing there is to use the right representation for the parameter type - in your case you have to append "f" suffix to the float value.
If you had trouble getting a Service Reference proxy in a .Net client application with code to call the custom operation you can read this article
. There you can find explanation why no code is generated for service operations and what to do in order to call one.
If you need any further assistance do not hesitate to contact us with your questions.
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