The Purchase Order, for which a Tender in accordance with these conditions is to be submitted, consists of Lump Sum (“LS”) items and or Schedule of Rates (“SR”) items, as specified in the Schedules.

Заказ на поставку, соответствующий условиям тендера, включает в себя пункты/единицы товара паушальной суммы.......????? все...дальше еще бредовее.

Еще вот это особенно не поняла:
....for which a Tender in accordance with these conditions is to be submitted....

Заранее благодарю

The Tender is for the completion of the whole of the Supply under the Purchase Order described in the Tender Documents.

оно в контексте этого же абзаца.

The Purchase Order, for which a Tender in accordance with these conditions is to be submitted, consists of Lump Sum (“LS”) items and or Schedule of Rates (“SR”) items, as specified in the Schedules. The Tender is for the completion of the whole of the Supply under the Purchase Order described in the Tender Documents.

Lump Sum (“LS”) items - см.
Lump Sum Items
Lump sum items are often used when an item of work can only be defined in general terms. For example, when the finished product can be defined but not all of the components or details can be easily determined, the use of lump sum items is acceptable