 Attributing this date to the Whm Mswt would create enormous problems for his own reconstruction of Egyptian history since West Theban graffito No.1393 forms part of a whole corpus of sources which Kitchen would never be willing to ascribe to the Whm Mswt since this would upset his whole chronology for the period.It has been proposed by Ad Thijs, followed by Aidan Dodson, that the era may have lasted into its year 15.This theory requires the reascription of papyri normally ascribed to the phase of the reign of Ramesses XI predating the Whm Mswt to the Whm Mswt itself.