There are so many conditions:
- the sales order may not belong to a project;
- the sales order line may not be marked i.e. directly covered by a purchase or production order (which happens all the time in the MRP planning at firming);
- the sales order line may not be physically reserved;
- the sales order may not be an intercompany one;
- the sales order line may not be [partially] picked, delivered or invoiced.
Don't ask for a justification; the most probable one is the tight budget for development in Seattle, Fargo and Copenhagen.
