Scale condition in a schdule agreement

Hi,

I created a schedule agreement for a material with one item, 200 pcs, and maintained the scales in the item conditions for the schedule agreement as follows:

scale Rate

10 1.5

20 1.4

30 1.3

40 1.2

50 1.1

...

But after MRP run, the purchase price can't changed according to the scale maintained in the item conditions of the schedule agreement.

So is there anything wrong?

Please kindly advise.

Thanks and best regards.