Merge internal tables

I hav 2 internal tables.

now i need to merge the data of two. into a 3 table how to do so.

1st

data: begin of it_errmsg occurs 10.

include structure bapiret2.

data: end of it_errmsg.

2nd

data : begin of it_mat occurs 0,

materialdoc1 type bapi2017_gm_head_ret-mat_doc,

matdocyear1 type bapi2017_gm_head_ret-doc_year,

end of it_mat.

3rr

data: begin of it_all occurs 10.

include structure bapiret2.

data : materialdoc2 type bapi2017_gm_head_ret-mat_doc.

data : matdocyear2 type bapi2017_gm_head_ret-doc_year.

data: end of it_all.

Plz guide

Edited by: ABHUT on Feb 22, 2008 12:56 PM