Period Lot size calculation in SNP heuristic

Hi APO gurus,

We send the truck from Point A to B to replenish stock every 8 days.

So we want the heuristic to builit lot size of 8 days of demand.

The demand only exist on weekdays.

Let say, demand is 10 EA on every workday.

So when I run heuristic on on Monday, I expect a lot size of 80.

But I get only 60., because heuristic does not consider planning workday calendar, but only regular calendar which includes weekend with no demand.

Any suggestion as to how to make heuristic take only workday demand into consideration while calculating lot size in period lot size strategy in SNP heuristic?

Thanks very much,

Ashok