Lattice Diamond: When do I encounter MWP timing error occur (At >Fmax) when constraining Edge Clock?

Lattice Diamond: When do I encounter MWP timing error occur (At >Fmax) when constraining Edge Clock?

Minimum pulse width timing error is triggered if and only if the minimum pulse width pin is connected to the clock net. 
If the pin is not connected to a clock net, then it does not affect the frequency requirement on that clock net.