VBA Script locks the excel sheet

[keepintouch]

While running the VB script which I'm using in SAP, whenever i run this script the excel sheet gets locked and the error message i get is "unable to write read-only property" and i see the property of excel sheet it says "Read Only". Please help where I'm going wrong. Thanks in advance.

If Not IsObject(application) Then
    Set SapGuiAuto = GetObject("SAPGUI")
    Set application = SapGuiAuto.GetScriptingEngine
End If
If Not IsObject(connection) Then
    Set connection = application.Children(0)
End If
If Not IsObject(session) Then
    Set session = connection.Children(0)
End If
If IsObject(WScript) Then
    WScript.ConnectObject session, "on"
    WScript.ConnectObject application, "on"
End If
session.findById("wnd[0]").maximize
Dim objExcel, objWorkbook, objSheet, i
Set objExcel = CreateObject("Excel.Application")
Set objWorkbook = objExcel.Workbooks.Open("C:\Users\TSK\Business_Area5.xlsx")
Set objSheet = objWorkbook.Sheets("Sheet1")
For i = 2 to objSheet.UsedRange.Rows.Count
     Business_Area = Trim(CStr(objSheet.Cells(i, 1).Value)) 'Column1
    Name = Trim(CStr(objSheet.Cells(i, 2).Value)) 'Column2
    session.findById("wnd[0]/tbar[0]/okcd").text = "ox03"
    session.findById("wnd[0]").sendVKey 0
    session.findById("wnd[0]/tbar[1]/btn[5]").press
    session.findById("wnd[0]/usr/tblSAPL0ORGCORETCTRL_V_TGSB/txtV_TGSB-GSBER[0,0]").text = Business_Area
    session.findById("wnd[0]/usr/tblSAPL0ORGCORETCTRL_V_TGSB/txtV_TGSB-GTEXT[0,0]").text = Name
    session.findById("wnd[0]/usr/tblSAPL0ORGCORETCTRL_V_TGSB/txtV_TGSB-GTEXT[0,0]").setFocus
    session.findById("wnd[0]/usr/tblSAPL0ORGCORETCTRL_V_TGSB/txtV_TGSB-GTEXT[0,0]").caretPosition = 12
    session.findById("wnd[0]/tbar[0]/btn[11]").press
next
msgbox "Created Business Areas"