[16] Incorrect product valuation

[prioueric]

When an product is received, its valuation takes into account only the first reduction.

Module

Purchase Order Triple Discount

Describe the bug

A clear and concise description of what the bug is.

To Reproduce

Affected versions: 16

Steps to reproduce the behavior:

1. Create a PO for one storable product
2. Unit price: 600.00 ->
   Disc. 1 = 50% -> Amount = 300.00
   Disc. 2 = 50% -> Amount = 150.00
   Disc. 3 = 50% -> Amount = 75.00
3. Do reception
4. Go to Inventory > Analyse > Valuation

Expected behavior
The value of the product is 300 intead of 75

See video : https://watch.screencastify.com/v/eH1yyQtpelIFt7uum6EP