output access sequence (header) - requirements

Hi together,

I have to restrict output determination for sales documents (output/header) for serveral materials.

That means, SAP must not create any output if a sales document contains certain material.

Therefore I´m trying to code 'requirements' for the output seqences.

The problem is, that I can not find any line item information (structures, tables,...).

Structure KOMPBV1 contains no data.

How can I include line item information?

Thanks for any help