Hi,
The column specification in SELECT does not match the internal table definition - try selecting INTO CORRESPONDING FIELDS OF TABLE IT_GIN_DTL.
I hope this does not have a chance to ever become something used in a productive system... Seeing this kind of code being written, and written inside of a form, is just depressing :| Just because you can write ABAP code inside of a form, or read/write a file, or even format a disc from within a form, doesn't mean it's a good idea to do so...
Form is mean for presenting data, not selecting - look up separation of concerns. The person who some time in the future may need to replace the smartform with, say, Adobe form, will rightfully fulminate seeing what has been done in the smartfom.
cheers
Jānis