It is possible to specify to which locations, Assign Quantity should be triggered on order lines. As a standard Assign Quantity is activated for al locations.
In Assign Quantity Setup two setups are required to set up.
Enable the action - "Only Assign to Selected Locations"
In Assign Quantity Setup, go to the Fast tab Assigning, and enable "Only Assign to Selected locations"
Select the locations
In Assign Quantity Setup, click on action Selected Locations
Choose a location in Location code. Make a line for each location, that should Assign Quantity.