Excel Macro unable to select from SAP drop down list

Hi,

I am trying to write a macro in excel to retrieve data from SAP for various order number which I will input into cell A1 to A*

I started it off with logging into SAP and start transaction.

My problem is when I goes into one of the transaction, it has a drop down list and I am unable to select anything via Excel Macro.

It always default to a variable and the drop down list will not appear.

I will then get a runtime error '613"

Normally when I go into sap manually and proceed, I will be able to select various item from the drop down list.

.StartTransaction "COOIS"

        .findById("wnd[0]").sendVKey 0

       'findById("wnd[0]/usr/ssub%_SUBSCREEN_TOPBLOCK:PPIO_ENTRY:1100/cmbPPIO_ENTRY_SC1100-PPIO_LISTTYP").Key = "PPIOV000"

       '.findById("wnd[0]").sendVKey 0

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.

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Any help would be appreciated.

Thanks