Access function returning a collection

[vbgladiator]

Hey,

I have a VBA program in Access and I just created a new function.
I want it to return a collection of objects that I create inside the function.

Private Function GetADPOrderDetails(OrderID As Long, AgencyID As Long) As Collection
    Dim blah As New Collection
    Dim rs As Recordset
    Dim sSQL As String
    
         
    'some code
    
    rs.Close
    Set rs = Nothing
    GetADPOrderDetails = blah
End Function

I am getting an argument not optional error and the GetADPOrderDetails = blah line is highlighted.

Can I not return collections in Ms-Access?

Thanks,