ATP stands for "Available To Purchase".
The "Available To Purchase" quantity is calculated in WMS 3.0 with total "Usable" status quantity and minus with
1. Buffered quantity
2. Order allocated quantity (In-picking/in-process).
3. Inventory management (Adjustment, Transfer & Stock-Take).
Note: If Anchanto OMS is connected with WMS, The "ATP" quantity is what will sync to OMS and to the rest of
connected sales channel.