against temporary receipt of materials law

[Netta]

Пожалуйста, подскажите, что имеется в виду в пункте "against temporary receipt of materials at work site":

Контекст:
The amount represents portion of the foreign currency of contract total value shall be paid for Equipment, materials and services value, transportation costs, erection, patents...which will be paid as follows:
- 80% against submitting shipment documents
- 10% against temporary receipt of materials at work site.

Мой вариант: под временную расписку о получении ????

Спасибо!

[Transl]

against - по предъявлении...