Предложение всречпется в следующем контексте:
Additional manpower. Should it appear necessary to provide Supplier's technical personnel at the Site for periods of time which exceed those indicated in Annex 7-A, the Supplier shall make available such personnel, at the Purchaser's request, as soon as available. To the extent the need of such additional manpower is due to reasons for which the Supplier is not responsible, the Purchaser shall pay for each additional man/day of such personnel the daily fees indicated in Annex 7-B. Such daily fees will be invoiced monthly to the Purchaser and will be paid by the latter before the end of the month following the month of the respective invoice.