purchase_last_price_info show oldest purchase price

[paulius-sladkevicius]

Module

purchase_last_price_info

Describe the bug

Last Purchase Price on the product is the oldest, not the latest price.

To Reproduce

Affected versions: tested with v14 but should affect and others

Steps to reproduce the behavior:

1. Create RFQ with a product price $10.0, confirm PO
2. Create another RFQ with a same product price $9.0, confirm PO
3. Check "Last Purchase Price" on the product. You should see $10.0 instead $9.0

Expected behavior

"Last Purchase Price" shows latest PO line purchase price

[paulius-sladkevicius]

I think an issue exists in this place line as it takes a first entry, but based on PO line sorting it sorts by oldest PO.