Hi,
Please check below link,
https://scn.sap.com/thread/3373797
http://scn.sap.com/thread/3145125
http://scn.sap.com/thread/1702455
Note 1844821:Fail to copy a Delivery with Excisable Sales BOM to Outgoing Excise Invoice
I think this property is not exposed to DIAPI, but some other way of solution, refer below coding for your example,
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Dim DeliveryForm As SAPbouiCOM.Form = objMain.objApplication.Forms.GetForm("140", objMain.objApplication.Forms.ActiveForm.TypeCount)
DeliveryForm.Mode = SAPbouiCOM.BoFormMode.fm_FIND_MODE
DeliveryForm.Items.Item("8").Specific.Value = oRsGetDeliveryDocNum.Fields.Item(0).Value
DeliveryForm.Items.Item("1").Click(SAPbouiCOM.BoCellClickType.ct_Regular)
DeliveryForm.Items.Item("10000329").Specific.Select(2, SAPbouiCOM.BoSearchKey.psk_Index)
Dim ExciseForm As SAPbouiCOM.Form = objMain.objApplication.Forms.GetForm("140080011", objMain.objApplication.Forms.ActiveForm.TypeCount)
ExciseForm.Items.Item("1").Click(SAPbouiCOM.BoCellClickType.ct_Regular)
ExciseForm.Close()
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Thanks & Regard,