When designing AWS 57 RO window in skylight I have error: Drainage channel gasket cannot be specified for insert units.

Solution:

The problem happens when on skylight unit you want to have drainage channel gasket installed. You enable it under Item properties window > Settings > Schuco FW 50[60] **.** > Technical settings > Gasket

After checking it on, in normal condition you have glass gasket 224981 (or 224982) with drainage channel to collect condensate from the glass installed on the purlin:

But when you design AWS 57 RO roof window in one of the units you can reach collision conflict with roof frame:

In this case do not worry about this message, condensate water will be managed by window construction. Gasket 244936 will be installed instead.