From the packing station or from the shipment or load, the sales packing slip can be posted.
This process is relatively slow because some unnecessary checks are still executed like inventory check.

Proposed optimization for packing slip posting:
When a sales packing slip posting is triggered from a shipment or load, skip the unnecessary checks.
1. Inventory is sufficient by definition because all goods are packed in containers, or the shipment and load status is confirmed.
2. IC sales orders: also in an intercompany or IC direct delivery scenario, the above applies