Using smart_selects in the admin for a ChainedManyToMany?

Looking for some help, if possible

Working Django with 1.11.x and Django smart_selects 1.5.x

from smart_selects.db_fields import ChainedManyToManyField

class Project(Model):
    """Project is a holder for a group of activities carried out as sub-projects.
    """
    id = AutoField(primary_key=True)
    name = CharField(unique=True)
    description = CharField()


class Milestone(Model):
    """Milestone is a time-based goal for a Project.
    """
    id = AutoField(primary_key=True)
    project = ForeignKey(Project)
    description = TextField()
    planned_year = PositiveIntegerField()
    planned_quarter()
   
   
class SubProject(Model):
    """SubProject is an activity carried out as part of a single Project.
    """
    id = AutoField(primary_key=True)
    project = ForeignKey(Project)
    code = CharField(unique=True)
    milestones = ChainedManyToManyField(
        Milestone,
        blank=True,
        horizontal=True,
        chained_field="project",
        chained_model_field="milestones")


However, the admin form for SubProject simply shows the usual admin multi-select box (i.e. just a long list of unfiltered milestones).

What needs to change in the above code to create a working smart_selects version?

Thanks

Derek

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