The same customer scheduled order can be an open order on two different waves. However, the system cannot process customer scheduled orders correctly when they are set up for multiple picking and pegging that occur in the wave replenishment and release steps. If you attempt to replenish a wave that has a customer schedule order on another open wave, the system displays an error message and blocks replenishment by:

When the system considers the quantity open on a wave with customer schedules, it does not take into account the quantities on other open waves. This is correct even though the quantity open on a wave does not reflect any other open, non-allocated quantities on another wave.

If another open wave for a customer schedule is in the replenishment stage, once you release that wave and the system processes it, you can replenish the other wave with the customer schedule that the system previously blocked. After you release a wave and the system completes detail allocations, the quantity open corresponds to the exact quantity.