foreign key issue

I'm setting up a foreignkey field in my model as follows:

InventoryFunction =
models.ForeignKey('AppSettings.InventoryOption',
verbose_name=_('InvFunction'), related_name='InvFunction',blank=False,
null=False)

result from syncdb:

scanning.inventory: Accessor for field 'InventoryFunction' clashes
with related field 'InventoryOption.InvFunction'. Add a related_name
argument to the definition for 'InventoryFunction'.
scanning.inventory: Reverse query name for field 'InventoryFunction'
clashes with related field 'InventoryOption.InvFunction'. Add a
related_name argument to the definition for 'InventoryFunction'.
scanning.inventoryhistory: Accessor for field 'InventoryFunction'
clashes with related field 'InventoryOption.InvFunction'. Add a
related_name argument to the definition for 'InventoryFunction'.
scanning.inventoryhistory: Reverse query name for field
'InventoryFunction' clashes with related field
'InventoryOption.InvFunction'. Add a related_name argument to the
definition for 'InventoryFunction'.

why am i getting these errors when i do have related_name argument
setup?

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