GL Expense allocation for items without activity

We are using GL expense allocation with PMAC. expenses are getting allocated for the ones having onhand or some activity. However, if an item is not produced and there is no onhand for a month, expenses are not getting allocated. item cost shows zero. Create accounting also does not show GL allocations (ALC) for that item. So, the question is, is there a way to post ALC for that item OR is there a way to carry forward the expense to next month?

Thanks,

Asish