django-admin change form page validation

Hi All

How can i apply validation in admin on various fields when they are dependent on each other ?

e.g. Let say in i have a  Field A(BooleanField)  and Field B (CharField) what i want to do is if in admin user select the Field A(checkbox) and does not enter anything in Field B
and if he tries to save ,it should throw an error like a normal blank=False gives. So how can i do this kind of validation in admin .

E.g  Use Case

I have a table having the following structure :-

INTERVIEW_TYPES = (
       
        ('default', 'None'),
        ('Paired Visit','Paired Visit'),
        ('Time Series', 'Time Series'),
        
    ),

class Interview(models.Model):
    ic_number              = models.CharField(verbose_name ="Visit Configuration Number",max_length=20,unique=True,null =True,blank=True)
    ic_description         = models.TextField(verbose_name ="Visit Configuration Description",null = True,blank=True)
    title                  = models.CharField(verbose_name ="Visit Configuration Title",max_length=80,unique=True)
    starting_section       = models.ForeignKey(Section)
    interview_type         = models.CharField(verbose_name = "Mapped Visit",choices=CHOICES.INTERVIEW_TYPES, max_length=80, default="Time Series")
    select_rating          = models.CharField(choices=CHOICES.QUESTION_RATING, max_length=80, default="Select Rating")
    view_notes             = models.CharField(choices=CHOICES.VIEW_NOTES, max_length=80, default="Display Notes")
     revisit                = models.BooleanField(default=False)   
.....and so on ......
  
    class Meta:
        verbose_name = 'Visit Configuration'
        verbose_name_plural = 'Visit Configurations'
       # ordering = ('rpn_number',)
   
    def __unicode__(self):
        return self.title

Its admin.py

class InterviewAdmin(admin.ModelAdmin):
    list_display = ('id','title', 'starting_section','ic_number','show_prior_responses')
    raw_id_fields = ('starting_section',)
admin.site.register(Interview, InterviewAdmin)

In admin , If i select the checkbox of revisit and in the field interview_type(which will show a dropdown having choices None,Paired Visit , Time Series) if a User has selected None from that dropdown and then press save button it should throw me an error like a normal blank=False shows, saying "This field is required"

How can i do this kind validation where fields are dependent on each other ? 

Please Ignore syntax error is any .

Thanks

--
Regards
Nikhil Verma
+91-958-273-3156

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