Configure on the location the package restriction.

The options are:

  * False (not set): No restriction, the location can contain products with and
    without package
  * Forbidden: The location cannot have products part of a package
  * Mandatory and unique: The location cannot have products not part of a
    package and you cannot have more than 1 package on the location
  * Mandatory and not unique: The location cannot have products not part of a
    package and you may store multiple packages on the location

When the module is installed, by default there is no restriction on the locations.

