Indeed introducing m2m relationship was just the solution for this case, 
now I have B form change with AB_B as  Inlines tabular item.
thanks a lot

On Sunday, July 13, 2014 7:48:05 PM UTC+1, Aeh. ABID wrote:
>
>     
>   
> I Have a model AB that holds two foreign keys A_id and B_id.
>
> class AB(models.Model):
>     A_id = models.ForeignKey('A')
>     B_id = models.ForeignKey('B')
>     field_1 = models.CharField(max_length=200, blank=True)
>     field_2 = models.CharField(max_length=200, blank=True)
>
>
> When editing A or B, AB items are edited inlines, what I want to achieve 
> is that when editing let's say B I want to keep the selected AB items and 
> set the foreign key B_id to null instead of deleting them.
>
> thanks for any hint
>
>
> http://stackoverflow.com/q/24726046/288387?sem=2 
>

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