in whcih cases we ahve to use reuse_alv_fieldcatalog_merge

hi gurus

can any one suggest me

in which cases we have to use reuse_alv_fieldcatalog_merge

i created a final internal table with types

than i passed the parameters to that function

i am getting an error

how to solve that problem.

instead of fill the catalog manually.

thank you

regards

kals.