Can ASCP consider work order allocations in pegging?

Ours is manufacturing environment and we use EDD constraint plan. We have lot of work order allocations happen on the components. But when we run the plan cycle, it does not honor the work order component allocations. Those work order demands are pegged to open supplies and other work order demands are pegged to onhand supply. I feel the plan goes by the work order demand requirement date and does not consider the allocation. Is there any way ASCP can collect and consider the work order allocations?