I have 3 models, the idea is that i can do many test on one product and a 
product can be removed of my stock (insert values in out table) by peoples. 
In django admin how can i do for blocking to insert values in Test table 
when the product is in the out table(inserted in the out table)? Where 
could i write the function to block the adding and how making the error or 
warning message come to the admin interface telling the user that product 
is removed?

class Person (models.Model): 
    name = models.Charfield (max_lenght=15) 

class Product (models.Model): 
    name = models.CharField (max_lenght=15) 

class Test(models.Model): 
    testname = models.Charfield (max_lenght=15) 
    product = models.ForeignKey(Product,on_delete=models.CASCADE) 

class Out (models.Model): 
    date= models.DateField () 


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