Workbook Opene and Activate Issue

[GLABA]

Hello, i have following Code:

       'Quelle definieren
        Dim AusS As Workbook
        Set AusS = ThisWorkbook
              
        'noch prüfen, dass die Zieldatei nicht bereits geöffnet ist
            If Datei_Geoeffnet(Path) Then
                MsgBox "File blocked!"
                GoTo ende
            End If
        
        'Ziel öffnen
           Set WB_Urlaub = Workbooks.Open(Filename:=Path)
           AusS.Activate  

*1 .... many code
...

ende:

Path ist already set and workbookwith this path opens
If i Debug step by step then at "*1" iam inside workbook AusS, meens the start workbook.
If i execute it, then it switch to the new open workbook at a random point in (*1)

what can i do?
thx