Hi all! I'm new to django and I'm experimenting with models but I have
some trouble. I've minimized my problem to this code:

class TestBase(models.Model):
    base = models.CharField(max_length=255)

from django.contrib import admin
class TestA(TestBase):
    testb = models.CharField(max_length=255)

admin.site.register(TestA)

class TestB(TestBase):
    testc = models.CharField(max_length=255)

admin.site.register(TestB)

Trying to add TestA instances from admin interface I have this error:
Cannot assign "''": "TestA.testb" must be a "TestB" instance.

why testb should be a TestB instance?? It's a simple field!

If TestBase is declared as abstract using the internal Meta Class I no
more have the error. Is this a bug or there is something that I don't
understand?

Thanks in advance :)

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