Problems using modulo in stateflow

Dear Sir / Madam,

I have issues with using the modulo function in Stateflow. To get of a absolute value in minutes the hours and minutes I do following:

tHtgAtvCnt // absolute minutes tHtgInAtvStd // hours tHtgInAtvMin // minutes

{tHtgInAtvStd = tHtgAtvCnt / 60; // Calculate hours tHtgInAtvMin = tHtgAtvCnt %% 60;} // Calculate minutes

If the value of the absolute minutes (tHtgAtvCnt) is bigger than a specific value (tested with 2^31) the result of the calculation is always -8. Is there any limitation on the modulo function?

Thank you very much for your support.

Best regards Michael Thierer