In our view, internal regulations constitute written collective instructions from the employer to his employees, upon whom they are binding.
Hierarchically, the internal regulations are of a lower level than the employment contract.
Thus, internal regulations may not derogate from the content of an employment contract.
If the internal regulations have been formally accepted by an employee by the subscription of his signature, they are regarded as an integral part of the employment contract and will have the same force as the latter.