I am developing a web app using Django. I have created the table in MySQL 
database and then generated the models.py using inspectdb. I am able to 
fetch details and connect to the database without any issues. But while 
saving the values to the particular table, below error is shown

*Cannot assign "3": "List.id" must be a "Order" instance.*

command used

sav_list = List(id=4, item_name ='name1', item_desc='desc1', 
location='location', reason='rfp',  pid=3)

*My models*

class List(models.Model):
    id = models.IntegerField(db_column='ID', primary_key=True)  # Field name 
made lowercase.
    item_name = models.CharField(db_column='Item_Name', max_length=255)  # 
Field name made lowercase.
    item_desc = models.CharField(db_column='Item_Desc', max_length=300)  # 
Field name made lowercase.
    location = models.CharField(db_column='Location', max_length=100, 
blank=True, null=True)  # Field name made lowercase.
    reason = models.CharField(db_column='Reason', max_length=100, blank=True, 
null=True)  # Field name made lowercase.
    pid = models.ForeignKey('Order', models.DO_NOTHING, db_column='PID')  # 
Field name made lowercase.
class Order(models.Model):
    poid = models.IntegerField(db_column='POID', primary_key=True)  # Field 
name made lowercase.
    po = models.CharField(db_column='PO', unique=True, max_length=20)  # Field 
name made lowercase.
    quote = models.CharField(db_column='Quote', unique=True, max_length=20)  # 
Field name made lowercase.

   condition = models.CharField(db_column='Condition', max_length=15)  # Field 
name made lowercase. 


I have tried relate_name for foreign key but still same behaviour. Same values 
can be stored on database without any issues. Only Django throws an error.

Please someone help me!!!

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