How to activate workbook exported from SAP?

I have a macro to process data from SAP.

When the workbook from SAP appears I am not able to activate it via VBA code below.

Even Workbooks("export.xlsx").activate does not work.

session.findById("wnd[0]/tbar[0]/okcd").Text = "/nFBL3N"
session.findById("wnd[0]").sendVKey 0
session.findById("wnd[0]/usr/btn%_SD_SAKNR_%_APP_%-VALU_PUSH").press
session.findById("wnd[1]/usr/tabsTAB_STRIP/tabpSIVA/ssubSCREEN_HEADER:SAPLALDB:3010/tblSAPLALDBSINGLE/ctxtRSCSEL_255-SLOW_I[1,0]").Text = "179811"
session.findById("wnd[1]/usr/tabsTAB_STRIP/tabpSIVA/ssubSCREEN_HEADER:SAPLALDB:3010/tblSAPLALDBSINGLE/ctxtRSCSEL_255-SLOW_I[1,1]").Text = "431311"
session.findById("wnd[1]/usr/tabsTAB_STRIP/tabpSIVA/ssubSCREEN_HEADER:SAPLALDB:3010/tblSAPLALDBSINGLE/ctxtRSCSEL_255-SLOW_I[1,1]").SetFocus
session.findById("wnd[1]/usr/tabsTAB_STRIP/tabpSIVA/ssubSCREEN_HEADER:SAPLALDB:3010/tblSAPLALDBSINGLE/ctxtRSCSEL_255-SLOW_I[1,1]").caretPosition = 6
session.findById("wnd[1]/tbar[0]/btn[0]").press
session.findById("wnd[1]/tbar[0]/btn[8]").press
session.findById("wnd[0]/usr/radX_AISEL").Select
session.findById("wnd[0]/usr/ctxtSO_BUDAT-LOW").Text = "01.03.2020"
session.findById("wnd[0]/usr/ctxtSO_BUDAT-HIGH").Text = "31.03.2020"
session.findById("wnd[0]/usr/ctxtSO_BUDAT-HIGH").SetFocus
session.findById("wnd[0]/usr/ctxtSO_BUDAT-HIGH").caretPosition = 10
session.findById("wnd[0]/tbar[1]/btn[16]").press
session.findById("wnd[0]/usr/ssub%_SUBSCREEN_%_SUB%_CONTAINER:SAPLSSEL:2001/ssubSUBSCREEN_CONTAINER2:SAPLSSEL:2000/ssubSUBSCREEN_CONTAINER:SAPLSSEL:1106/ctxt%%DYN009-LOW").Text = "L6"
session.findById("wnd[0]/usr/ssub%_SUBSCREEN_%_SUB%_CONTAINER:SAPLSSEL:2001/ssubSUBSCREEN_CONTAINER2:SAPLSSEL:2000/ssubSUBSCREEN_CONTAINER:SAPLSSEL:1106/ctxt%%DYN009-LOW").SetFocus
session.findById("wnd[0]/usr/ssub%_SUBSCREEN_%_SUB%_CONTAINER:SAPLSSEL:2001/ssubSUBSCREEN_CONTAINER2:SAPLSSEL:2000/ssubSUBSCREEN_CONTAINER:SAPLSSEL:1106/ctxt%%DYN009-LOW").caretPosition = 2
session.findById("wnd[0]/tbar[1]/btn[8]").press
session.findById("wnd[0]/mbar/menu[0]/menu[3]/menu[1]").Select
session.findById("wnd[1]/tbar[0]/btn[11]").press

Set session = Nothing
Set Connection = Nothing
Set SapGuiAuto = Nothing
Set WScript = Nothing
Set Application = Nothing

Dim wb As Workbook
Windows("export.XLSX").Activate

Solution

In order to check the existence of the workbook in all open Excel sessions, please use the next code, as I will explain

Firstly copy the next code on top of your module (in the declarations part):

Option Explicit

#If VBA7 Then
  Private Declare PtrSafe Function AccessibleObjectFromWindow Lib "oleacc" ( _
    ByVal hWnd As LongPtr, ByVal dwId As Long, riid As Any, ppvObject As Object) As Long

  Private Declare PtrSafe Function FindWindowExA Lib "user32" ( _
    ByVal hwndParent As LongPtr, ByVal hwndChildAfter As LongPtr, _
    ByVal lpszClass As String, ByVal lpszWindow As String) As LongPtr
#Else
  Private Declare Function AccessibleObjectFromWindow Lib "oleacc" ( _
    ByVal hwnd As Long, ByVal dwId As Long, riid As Any, ppvObject As Object) As Long

  Private Declare Function FindWindowExA Lib "user32" ( _
    ByVal hwndParent As Long, ByVal hwndChildAfter As Long, _
    ByVal lpszClass As String, ByVal lpszWindow As String) As Long
#End If

Then, use the next function to be called from your existing code (instead of Windows("export.XLSX").Activate):

Private Function GetExcelSes() As Collection
    Dim g&(0 To 3), ppv As Object, hWnd, hWnd2, hWnd3
    g(0) = &H20400: g(1) = &H0
    g(2) = &HC0:    g(3) = &H46000000

    Dim AlreadyThere As Boolean, Xl As Application
    Set GetExcelSes = New Collection
    Do
        hWnd = FindWindowExA(0, hWnd, "XLMAIN", vbNullString)
        If hWnd = 0 Then Exit Do
        hWnd2 = FindWindowExA(hWnd, 0, "XLDESK", vbNullString)
        hWnd3 = FindWindowExA(hWnd2, 0, "EXCEL7", vbNullString)
        If AccessibleObjectFromWindow(hWnd3, &HFFFFFFF0, g(0), ppv) = 0 Then
            AlreadyThere = False
            For Each Xl In GetExcelSes
                If Xl Is ppv.Application Then
                    AlreadyThere = True
                    Exit For
                End If
            Next
            If Not AlreadyThere Then
                GetExcelSes.aDD ppv.Application
            End If
        End If
    Loop
End Function

The above function can be called as in the following example (use it like it is instead of your last code line). The declarations are important:

Sub TestSaveAWbFromAllSess()
   Dim Ex As Collection, El As Variant
   Dim wb As Workbook, expWb As Workbook
   Set Ex = GetExcelSes

   For Each El In Ex
        For Each wb In El.Workbooks
            Debug.Print wb.Name 'just to see all open wb names, confirming that the function works...
            If UCase(wb.Name) = "EXPORT.XLSX" Then
                Set expWb = wb
                'Do here whatever you need with the found workbook. For instance:
                expWb.SaveCopyAs fileName:=ThisWorkbook.path & "\TestSAPExport.XLSX"
            End If
        Next
   Next
End Sub