ME23N transaction ordernumber

hello all,

in transaction ME23N there is field called ORDER NUMBER...

in which table field this order number is saved ,

and how do i relate this order number with service specifications,

because in my ALV report i need to display like this,

itemno.   serviceno.   quantity.   units.  grossvalue.   ordernumber.

----------     --------------      ----------      -----     -----------------     ----------------

these itemno,serviceno,quantity ,units and gross value i have derived it from

tables EKPO,ESLH and ESLL..

now from where to get this aufnr how do i relate with above one...

thankq...