confusion in mipv6 I-D?

In 11.7.1, page 131:

"The care-of address for the binding MUST be used as the Source Address in 
the packet's IPv6 header, unless an Alternate Care-of Address mobility 
option is included in the Binding Update."

In same section, page 132:

"The mobile node MUST use its home address - either in the Home Address 
destination option or in   the Source Address field of the IPv6 header - in 
Binding Updates sent to the home agent."

I would recommend some additional explanation, since the Source Address 
can't hold both the home address and the care-of address.  It would appear 
that at least one of the two options is required to avoid the conflict.  If 
both options are present, what is the recommended content of the Source 
Address field?


Frank Quick
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