RQM 5.0 : Show error message at the time of Test execution if no requirement links with Test Case.

I have four Test cases in which only one i have manually linked with "requirement"  but not the rest of three. if i select all four test cases and execute,  they are getting executed. That's fine but I want to put a restriction that if no "requirement" linked with Test case then User get error message at the time of execution and RQM not let this execution to be completed . I know there are already some pre-conditions in RQM but i don't think this can be possible through given "Pre-conditions".Any possible solution to this?. Thanking you in advance.