I set the default dropdown to follow ComboBox.
When I create and save, 'Business' change by 'Site'
[Business is dropdown list and Site is ComboBox and I set 'Business' in Default with by 'Filter' Function'
code is : LookUp(FactoryData,Title = factory_card_1.Selected.Title,OData__x0e3a__x0e35_BU)]

After I save and go to Edit the dropdown does not follow with 'Site'. [As pic]
For the 'Site' I set at DefaultSelectedItem by
{
'@odata.type':"#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
Value:Parent.Default
}
The Business should be 'PPP' but it shows 'PP'.
How to solve this problem. Please advise me.

Thank You.