use of Macros in BEx-IP planning workbooks

Hi,

I added following macro code in sheet "Sheet4 (BEx)" of BExAnalyzer and trying to assign this macro to a VB button inserted in workbook. But, i'm unable to find macro test123. what could be the reason?

Sub test123()

  Dim lResult As Long

  lResult = Application.Run("SAPExecuteCommand", "Refresh")

End Sub

Then, i tried same macro code in "ThisWorkbook" listed under "Microsoft Excel Objects" of VBA project of BI workbook.  Now, i am able to see macro test123 and assigned to VB button. But, when i click on VB button, i'm getting VB error 400. There must be something simple am doing wrong. Could someone point me in right direction or could someone share a sample of macro code as i'm actually trying to achieve "execution of planning sequence with variables by taking values from user inputs".