[Mp4-tech] [H.264] Initialisation process for ref. pic. list in fields

[Marco.Miehe sci-worx.com]

Dear Members
I have a question regarding the Initialisation process for reference
picture list for P slices in fields.
In the standard ITU-T Rec. H.264 chapter 8.2.4.2.2 
I found the following sentence.
"When the current field is the second field (in decoding order) of a
complementary reference field pair 
and the first field is marked as "used for short-term reference", the
first field is included in the 
list of short-term reference frames refFrameList0ShortTerm."
What does it mean exactly?
Only the first field of a complementary reference field pair (the first
field is marked as "used for short-term reference")
is included in the refFrameList0ShortTerm and we ignore the second
field?
I mean in the Reference Software JM 9.7 they don't check this. If this
Frames or Field is "used for reference" they include
this frame or field in the refFrameList0ShortTerm and do nothing more.
I'd appreciate if some one clarifies this.
Best regards,
Marco Miehe