How to force demantra to not generate forecast for non-business days

 Hi everyone, does anybody know how to force demantra to not generate forecast for non-business days? Our prospect delivers goods to different locations.
In some locations no goods is delivered on saturdays and sundays but in other locations no goods is delivered on sundays and mondays for example.
Is there any other way to achieve this then  defining local causal factor 'business day'?
Any help would be very appreciated
Petr