Clear "VatGroup" in Journal Entry matrix

Hi,

I'm trying to clear the "VatGroup" in the Journal Entry matrix (V6.5 SP1) with the code:

For i=1 To oMatrix.RowCount

oMatrix.Columns.Item("17").Cells.Item(i).Specific.Select(0,SAPbouiCOM.BoSearchKey.psk_Index)

Next

but, I can't do it.

I can change the "VatGroup" to any value in ComboBox but not to the empty value.

I've tryed the "SAPbouiCOM.BoSearchKey.psk_ByValue" and "SAPbouiCOM.BoSearchKey.psk_ByDescription" options and I get the same result.

In v2004 it's OK.