Abort chunk bundled with data chunk

Hi, 

We have a confusion while understanding the SCTP RFC4960 section 9.1 it
says "DATA chunks MUST NOT be bundled with ABORT" so sender must not
bundle the data with abort. 

But the second paragraph states that "An endpoint MUST NOT respond to
any received packet that contains an ABORT chunk". Which means if any
packet is received at the receiver end where ABORT is bundled with the
DATA it should not send any response. Does it mean that for the DATA
chunk SACK should not be generated? Please clarify.

Thanks,
Salil Agrawal