Enhancing data source 0GL_ACCOUNT

Hi Experts,

I want to enhance the data source 0GL_ACCOUNT, with extraction structure BIW_SKA1. This structure is a view, with table SKA1. Now, I want to have 2 more fields (custom gl grouping for reporting) into this DS. But I sure don't want to enhance the table SKA1. Is any method available for this??

Regards,

Arun.