How do I make the effective price not the lowest quantity on tiered pricing?

Hello,

We person tiered pricing for an item.  for example, the tiers are 

qty 3000  - $900.00 /1,000 units

qty 5000 - $ 700.00/1,000 units

qty 10,000 - $400.00/1,000 units

qty 25000 - $200.00/1,000 units

We usually bargain the merchandise astatine the 10,000 increment, which would beryllium $400.00 per 1,000 units.  I would similar that denomination to amusement up successful ME12 for nett terms and effectual price, arsenic that is what is utilized for costing. 

I would similar to besides enactment the full tiered pricing into the conditions PB00, nevertheless when  I bash that, it changes the nett & effectual terms to the lowest outgo of the tier. 

How bash I debar this?