@property<EOL><INDENT>def reference_id(self):<DEDENT>
return self._reference_id<EOL>
Gets the reference_id of this InventoryAdjustment.
An optional ID provided by the application to tie the [InventoryAdjustment](#type-inventoryadjustment) to an external system.

:return: The reference_id of this InventoryAdjustment.
:rtype: str