data declaration error in adobe form

hi,

i m just remake a smartform into adobeform.but while doing so it's giving me error regarding data declaration.

I had declare some of internal table as type of defiened type but at code initialzation it giving it's not a internal table.

global data

it_abc type ty_abc,

types :

types: begin of ty_abc,

ab(8) type c,

bc(4) type c,

end of abc.

when i m creating a internal table in code initialization it's giving me that already declared.

code initialization.

data : it_abc type table of ty_abc.

Plz help me out.

Regards

Ricky