[Avodah] HELP - Why is there an Issur BBCh on a Nefel/Shellil?

[Micha Berger]

On Sun, Dec 31, 2017 at 12:31:32PM +1100, Rabbi Meir G. Rabi via Avodah wrote:
: I have yet to find anyone asking this Q -
: the Nefel and Shelil seem to be the same thing
: it is a Neneilah
: yet it is Assur to eat as BBCh - why is there no Ein Issur Chal Al Issur?

Is it because BbCh is a issur kolel, since it includes not only issur
akhilah, but also a general issur hana'ah?

:-)BBii!
-Micha