**Background:**
Let be given a mechanical system whose configuration space is a manifold $Q$, and the kinetic energy is a metric $K$ on $Q$, in presence of a potential function $V$.  
Let us identify the tangent bundle $TQ$ with the phase space $T^\ast Q$ through the Legendre map $\mathcal{L}_K$. Let $X_L$ be the second order differential equation on $M$ corresponding to the lagrangian $L=K+\pi^\ast V$.  

If the system is subject to a kinematical constraint represented by a submanifold $M$ of $TQ$, then we need to find the vector field $X$ on $M$ which determines the dynamics of such a constrained system, the difference $X_C=X-X_L$ being the contribution of the constraint force.

Under mildly assumption a prescription to find $X_C$ is the Appel-Chetaev rule, which extends the Lagrange-D'Alembert principle in the context of constraints that are not necessarily linear on the velocities.  This rule imposes that $X_C$ has to lie on $(TM)^{0}$, the annihilator of $TM$.

**Question:**
Are there constrained mechanical systems whose dynamics is not in agree with the previsions following Appell-Chetaev's rule? And in such a case what are the alternative rules in prescribing the constraint forces?