Hi @v-yutliu-msft ,
1) 'PO Number' Data type is Text
2) 'PO Number' Control - Combo box
I have been editing this app using the "Edit" button from PowerBI, and also used this to create the app.
What seems strange to me is that the issue is not consistent as for a same 'PO Number", while there should be for example 2 'PO Line : Part Number' visible in Power BI, only one appear in the list box while no filter has been applied.
I am not sure if this is linked to Delegation isssue as the data contains more than 30,000 rows, but I understand that PowerBI already filters the data sent to PowerApps (in this case via 'PO Number' which number of 'PO Line : Part Number' is less than 50 max).
Best Regards