We enabled pricelists for the purchase and sales modules and edited the default purchase pricelist, we set the default rule from based on "cost price" to based on "supplier prices on the product form".

We added a supplier to a product and defined the following prices:

Quantity -> Unit Price

1 -> 200

10 -> 180

100 -> 150

1000 -> 100

Now, when we print the product cost structure of the bom which contains this product, the prices are not correct.

Here is the example output in the generated PDF file:

Quantity -> Unit Price

1 -> 200 -> OK

2 -> 200 -> OK

3 -> 200 -> OK

4 -> 180 -> NOT OK

5 -> 180 -> NOT OK 

10 -> 150 -> NOT OK

1000 -> 100 -> OK

The correct behaviour should be:

1 -> 200

2 -> 200

...

9 -> 200

10 -> 180

...

99 -> 180

100 -> 150

...

999 -> 150

1000 -> 100

So, how are the prices calculated? Or is it a bug?