Position
Management 
Purpose
You can use Position Management in Global Trade Management to reduce inventory risk and lost sales.
Two functions exist to help you do this:
Using Portfolio Management you can control values that you entered when you were creating the trading contract. A special key is assigned dynamically to the contract item. This key serves to optimize use of sales-side and purchasing-side quantities.
You can use association management to create links (associations) between sales and purchasing data at item level. The system tracks material position information, and creates links between sales and purchasing based on the key information, portfolio. You can maintain this link flexibly. You create, change or delete this relationship during logistics document processing.