Does supply plannning consider schedule exceptions of manufacturing plants?

Hi community,

I am implementing supply planning module right now.

It seems that the lead times of planned make orders does not consider hoildays of manufacturing plants.

The processing time of a make item is 40 days and its manufacturing plant has some holidays(=schedule exceptions).

However, supply planning ignores that holidays and simply suggest we start making the item 40 days prior.

Is it possible for supply plannning to consider schedule exceptions of manufacturing plants?