The greater and less than operator does not appear when the class is tied to a data source in web rule engine

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MVC

Hi,

We are evaluating Codeeffects for our project.
We have a requirement to retrieve a range of values, save it as a rule and perform a search or another rule on the primary set of values.

For eg. in the demonstration project we want to be able to search for country id's greater than 4 and less than 9, and save them in a rule - say "CountryRule".
Here the values 4 and 9 will be populated from a drop down that is connected to a data source.
Further on we will create another rule to compute the billing amount on the "CountryRule"

The greater and less than operator does not appear when the class is tied to a data source. Is this a default or can this be altered?
In case it can, please do let us know how to make the operators work.

Thanks