Enhancement for vf01?

Hi all,

i have a requirement in vf01 transaction.

doc.header text(bktxt)

reference key1(XREF1_HD)

reference key1(XREF2_HD)

these 3 fields automatically get kunnr and land1 records from vbpa table.

Please give me a solution for this.

user exit name - EXIT_SAPLV60B_001.

include name - ZXVVFU01.

i actually pass the data to

WHEN C_PARVW1.

XACCHD-BKTXT = WA_VBPA-LAND1.
WHEN C_PARVW3.
XACCIT-XREF1_HD = WA_VBPA-KUNNR.
WHEN C_PARVW2.
XACCIT-XREF2_HD = WA_VBPA-KUNNR.

doc.header text field only populated.

reference key1 and 2 is not populated.

Please give me a solution.urgent.

Thanks,

Kalyan.