48In the second place, as regards the question whether a change of geographical assignment, such as that at issue in the main proceedings, must be classified as a ‘substantial change’ within the meaning of that case-law, it should be noted that the substantial nature of such assignment depends, inter alia, on whether or not the contemplated change to the employment contract is temporary, on the distance between the place of work of origin and the place of the new assignment, and on any other accompanying measures intended to compensate for the proposed assignment.