BAPI function module to get process orders for certain material

Dear experts ,

kindly , I need my vb application to get all CRD , but not DLV Process orders for Material X.

Into SAP , I use the COIO , then set material to X , then display flag CRTD included , and Exclude DLV.

Question now , What is the function module that does this. what is the table name , and how to set search parameters.

my code will be like this

theFunc = functionCtrl.Add("BAPI_PO_GETDETAIL") ' get po data

   theFunc.exports("purchaseorder") = t.Text

             returnFunc = theFunc.call

        returnParam = theFunc.imports("po_header")

        retTab = theFunc.tables("po_items")

        For Each rr In retTab.Rows

            tt1.Text &= (rr("MATERIAL")) & vbTab

        next

Thanks

Waleed