Single controller with multiple GET methods in ASP.NET Web API

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In Web API I had a class of similar structure:

public class SomeController : ApiController
{
    [WebGet(UriTemplate = "{itemSource}/Items")]
    public SomeValue GetItems(CustomParam parameter) { ... }

    [WebGet(UriTemplate = "{itemSource}/Items/{parent}")]
    public SomeValue GetChildItems(CustomParam parameter, SomeObject parent) { ... }
}

Since we could map individual methods, it was very simple to get the right request at the right place. For similar class which had only a single GET method but also had an Object parameter, I successfully used IActionValueBinder. However, in the case described above I get the following error:

Multiple actions were found that match the request: 

SomeValue GetItems(CustomParam parameter) on type SomeType

SomeValue GetChildItems(CustomParam parameter, SomeObject parent) on type SomeType

I am trying to approach this problem by overriding the ExecuteAsync method of ApiController but with no luck so far. Any advice on this issue?

Edit: I forgot to mention that now I am trying to move this code on ASP.NET Web API which has a different approach to routing. The question is, how do I make the code work on ASP.NET Web API?

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