Get data from temp table

Dear All ABAP Exeprts,

I have written a query  but it gives error on 

t_vbak-KNUMV as KNUMV  line

I want to get KNUMV from the   t_vbak  table. How can I write this query.?

Regards,

Aneel

SELECT vbeln " Sales Document

     posnr " Sales Document Item

     matnr " Material Number

     arktx " Short text for sales order

     " item

     kwmeng " Cumulative Order Quantity

     vrkme " Sales unit

    t_vbak-KNUMV as KNUMV

     FROM vbap

     INTOTABLE t_vbap

     FORALL ENTRIES IN t_vbak

     WHERE vbeln EQ t_vbak-vbeln.