Glami feed is not updated

According to the glami documentation the variations should be send like this:
<PARAM>
<PARAM_NAME>size</PARAM_NAME>
<VAL>41</VAL>
</PARAM>
and all the variations should have the same <ITEMGROUP_ID>
but right now the only option I see is to generate <size>S, XS, M, L, XL, XXL</size> that’s marked as wrong in documentation.

Thank you