LO fields not appearing in Extract structure

Hi experts,

Some fields are not displaying in extract structre of 2LIS_11_VASCL.

Though field are avaiable in communication structure ( in LBWE when click on structure 'Maintence' ....its avaiable in left side.)

when i looking extract structe in rsa2. its not showing all fields which are avaiable in commnication structure. and when i replicating BI side...... there also its not avaiable

Pls help me........ how to reflect those communication structure fields (left side one in LBWE) into extract structure

thanks

pavan