When the planning system detects demand at a location, it will behave in different ways depending on three critical setup values. System of Inventory Planning with using different location working as flowchart bellow:

Even if the Location Mandatory field is selected, the program will allow demand lines to be created without a location code, also referred to as blank location. This is a deviation for the system because it has various setup values tuned to dealing with locations and as a result, the planning engine will not create a planning line for such a demand line.