The {@link org.eclipse.gmf.runtime.emf.core.internal.exceptions.MSLActionProtocolException} signals attempts to interact with MSL-managed models "outside" of the protocol specified by the {@link org.eclipse.gmf.runtime.emf.core.util.OperationUtil} class.
@see org.eclipse.gmf.runtime.emf.core.util.OperationUtil @see org.eclipse.gmf.runtime.emf.core.edit.MRunnable @canBeSeenBy org.eclipse.gmf.runtime.emf.core.*