Understanding SAP scripting code

Function CheckNumberOfSAPSessions() As Integer

    Dim sap As Object
    Dim sapGui As Object
    Dim sapCon As Object
    Dim sapSession As Object
    Dim i As Integer
    Dim j As Integer
    
    Dim AnzahlSAPSessions As Integer
    AnzahlSAPSessions = 0
    Dim vartemp(10000, 3) As Variant
    Set sap = GetObject("sapgui")
    Set sapGui = sap.getscriptingEngine
    'loop through open connection
    For i = 0 To sapGui.Connections.count - 1
        Set sapCon = sapGui.Children(CLng(i))
        'loop through sessions on the connection
        For j = 0 To sapCon.sessions.count - 1
            Set sapSession = sapCon.Children(CLng(j))
            'list down the info
            With sapSession.info
                vartemp(j, 1) = .systemname
                vartemp(j, 2) = .sessionnumber
                vartemp(j, 3) = .transaction
                AnzahlSAPSessions = AnzahlSAPSessions + 1
            End With
        Next j
    Next i
                 
    Set sapSession = Nothing
    Set sapCon = Nothing
    Set sapGui = Nothing
    Set sap = Nothing
CheckNumberOfSAPSessions = AnzahlSAPSessions

End Function

Sub SAPAutomatisieren()
Dim Datevon, Datebis As Date
Dim SapGuiAuto As Object
Dim SAPApp As Object
Dim sapCon As Object
Dim session As Object

If CheckNumberOfSAPSessions > 0 Then
    UF_Datumswahl.Show
    Datevon = Sheets("Board").Cells(9, 2)
    Datebis = Sheets("Board").Cells(10, 2)
    
      Set SapGuiAuto = GetObject("SAPGUI")  'Get the SAP GUI Scripting object
      Set SAPApp = SapGuiAuto.getscriptingEngine 'Get the currently running SAP GUI
      Set sapCon = SAPApp.Children(0) 'Get the first system that is currently connected
      Set session = sapCon.Children(0) 'Get the first session (window) on that connection
            
    '###########################################################################################################
  'I NEED EXPLANATION FROM HERE
    session.findById("wnd[0]/tbar[0]/okcd").Text = "/n" 'Zurück ins Hauptmenü befehl
    session.findById("wnd[0]").sendVKey 0  'Befehl ausführen
      
    session.findById("wnd[0]/tbar[0]/okcd").Text = "zfmz" 'Befehl material anzeigen
    session.findById("wnd[0]").sendVKey 0 'Befehl ausführen
    
    session.findById("wnd[0]/usr/ctxtS_QMART-LOW").Text = "q3"
    'session.findById("wnd[0]/usr/ctxtS_QMART-HIGH").Text = "q3"
    session.findById("wnd[0]/usr/ctxtS_QMDAT-LOW").Text = Datevon
    session.findById("wnd[0]/usr/ctxtS_QMDAT-HIGH").Text = Datebis
    session.findById("wnd[0]/usr/ctxtP_VAR").Text = "/Q-TISCH"
   
    session.findById("wnd[0]/usr/ctxtS_MATNR-LOW").SetFocus
    session.findById("wnd[0]/usr/ctxtS_QMDAT-HIGH").caretPosition = 10
   
  
    session.findById("wnd[0]/tbar[1]/btn[8]").press
    
    'Filter Löschvermerk setzen
    session.findById("wnd[0]").maximize
    session.findById("wnd[0]/tbar[1]/btn[38]").press
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/cntlCONTAINER1_FILT/shellcont/shell").currentCellRow = -1
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/cntlCONTAINER1_FILT/shellcont/shell").selectColumn "SELTEXT"
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/cntlCONTAINER1_FILT/shellcont/shell").pressColumnHeader "SELTEXT"
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/cntlCONTAINER1_FILT/shellcont/shell").currentCellRow = 128
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/cntlCONTAINER1_FILT/shellcont/shell").firstVisibleRow = 117
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/cntlCONTAINER1_FILT/shellcont/shell").selectedRows = "128"
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/btnAPP_WL_SING").press
    session.findById("wnd[1]/usr/subSUB_CONFIGURATION:SAPLSALV_CUL_FILTER_CRITERIA:0600/btn600_BUTTON").press
    session.findById("wnd[2]/usr/ssub%_SUBSCREEN_FREESEL:SAPLSSEL:1105/btn%_%%DYN001_%_APP_%-VALU_PUSH").press
    session.findById("wnd[3]/usr/tabsTAB_STRIP/tabpNOSV").Select
    session.findById("wnd[3]/usr/tabsTAB_STRIP/tabpNOSV/ssubSCREEN_HEADER:SAPLALDB:3030/tblSAPLALDBSINGLE_E/ctxtRSCSEL_255-SLOW_E[1,0]").Text = "LÖVM"
    session.findById("wnd[3]/usr/tabsTAB_STRIP/tabpNOSV/ssubSCREEN_HEADER:SAPLALDB:3030/tblSAPLALDBSINGLE_E/ctxtRSCSEL_255-SLOW_E[1,0]").caretPosition = 5
    session.findById("wnd[3]/tbar[0]/btn[8]").press
    session.findById("wnd[2]/tbar[0]/btn[0]").press
    
    'Tabelle exportieren
    session.findById("wnd[0]/mbar/menu[0]/menu[1]/menu[2]").Select
    session.findById("wnd[1]/tbar[0]/btn[0]").press
    session.findById("wnd[1]/usr/ctxtDY_PATH").Text = "O:\Bereich_Q\Fehlermanagement\Q_Tisch\Auswertungen\Ampelliste\Abfragedatei\"
    session.findById("wnd[1]/usr/ctxtDY_FILENAME").Text = "Fehlermeldung_Q-Tisch.dat"
    session.findById("wnd[1]/usr/ctxtDY_FILENAME").caretPosition = 13
    session.findById("wnd[1]/tbar[0]/btn[11]").press
  
'I NEED EXPLANATION UP TO HERE  

    '###########################################################################################################
      Set SapGuiAuto = Nothing
      Set SAPApp = Nothing
      Set sapCon = Nothing
      Set session = Nothing
      
      Sheets("Board").Activate
 
Else
    MsgBox ("Bitte SAP-Session starten")
    End
    
End If
End Sub

I am new in programming with SAP Script and I just took over the code of a colleague. When I run the code (See code attachment) I get the "run time error 613" at the following line

session.findById("wnd[3]/usr/tabsTAB_STRIP/tabpNOSV/ssubSCREEN_HEADER:SAPLALDB:3030/tblSAPLALDBSINGLE_E/ctxtRSCSEL_255-SLOW_E[1,0]").Text = "LÖVM"

I wish to understand what the code does line after line on the places where I have indicated (see code attachement). I will be very grateful if I could get some help. Immense thanks in advance.

Ndonwi