Passing an internal table WITH HEADER LINE to abap object

Hi. In another thread, it was explained how to pass an internal table to an abap object method. Is it possible to pass an internal table that has a header line, and RETAIN the header line once the table has been passed?

My problem is, that I can pass the table, update it, but the read buffer is not populated when returning from the object's method. This is the result of being able to pass a STANDARD TABLE type, but not a STANDARD TABLE WITH HEADER LINE.

This means that I have to read the table into a work area instead of doing a READ TABLE LKNA1 within the method, which is what I need to do.

Thanks.