VA01 Screen Enhancement

Hi Experts,

i have added some fields in header level (8309) and in Item level(8459), but i have same fields in both the levels,

so i want to replicate the headre level data to the item level,

i have done this perfectly,

but my problem is,

if i go to item screen and if press save then it is saving item details into VBAP, but when i save the document form header level then it is not saving the item details into VBAP table. it is saving only header level details,

i tried in all the exits,

move_vbap,

move_vbak,

save,

but nothing is working in my case,

i am using 4.6b version,,

can any one help me out,

thanks in advance,

regards,

muralidhar.