table join

data : begin of it_rbkp occurs 0.

include structure rbkp.

data : awkey like bkpf-awkey,

end of it_rbkp.

data : begin of it_bkpf occurs 0.

include structure bkpf.

data : end of it_bkpf.

select * from rbkp into corresponding fields of table it_rbkp

where belnr in belnr and gjahr in gjahr.

loop at it_rbkp.

concatenate it_rbkp-belnr it_rbkp-gjahr into it_rbkp-awkey.

modify it_rbkp transporting awkey.

endloop.

select * from bkpf into corresponding fields of table it_bkpf

for all entries in it_rbkp where awkey = it_rbkp-awkey.

I have tried in this manner. it worked for me.