Standard vendor searching logic on purchase requisition line should be more accurate regarding purchase agreements and trade agreements.

Actual rules and propositions depend of the case:

1. Purchase requisition for catalog item:
- Actual behavior: system searches first if an effective purchase agreement exists, if yes the vendor is selected and the price and discounts applied, then it searches if a price trade agreement exists, if yes the vendor for the lowest price is selected. If both exist, vendor can be changed by user for one and another.
- Problem: even if other price trade agreements exists, concerned vendors cannot be selected at all
- Proposition: allow to select any vendor for all effective purchase agreements and active price trade agreements that can be applied

2. Purchase requisition for non catalog item (category only):
- Actual behavior: system searches if an effective purchase agreement exists (value commitment or category value commitment), if yes the vendor is selected and the discount applied
- Problem: system always selects by default the vendor for the first agreement found. Other problem is this search does not check category policy rule for allowed vendors (another MS ideas is already logged for this matter)
- Propositions: never select vendors for effective Value commitment agreement, this is not a business logic, total value commitment does not mean that vendor is preferred or applicable for all categories at the purchase requisition step in the purchasing process. Category value commitment agreement can be selected but in this case, there should be some setup or logic to select the right one if various vendors can be applied.

3. General proposition: review vendors and price/discount search on purchase requisition line with some setup because the actual logic is hard-coded and too restrictive, and make it compatible with purchasing policy rules.