10.3.3 : SLVS : missing specs for MainSoundConfiguration

[JBoisseau-ByDeluxe]

section 10.3.3 defines the MCA section for SLV track, but it doesn't specify the tag to use in the MainSoundConfiguration.

I seems that implementations considered to re-use the MCA tag "SLVS" in the MainSoundConfiguration, like:
<cpl-meta:MainSoundConfiguration>51/L,R,C,LFE,Ls,Rs,-,-,-,-,-,-,-,-,SLVS,-</cpl-meta:MainSoundConfiguration>

But that is not explicitely defined in the document.