SLS SITA Message - format example needed

[Planetick]

Hi guys,

one of our customers requested us to start sending SLS (statistical load summary) messages. We have no experience with SLS in the past, so I would be greatful if anyone could help me with an example in regard to format and content. (or maybe PM me the relevant page of AHM588)

We did get a few examples from other stations but they were all different and did not show the same format.

Here is one example:

SLS
XX126/26.ABCDE.A320-214.FRA.26MAY17
-ABC.YY/114.GG/0.B/494.C/677.S/0.M/50+

I guess YY is PAX, B is baggage, C is cargo and M mail, but what does GG and S stand for ?

Thanks in advance.

Stefan