We have added a restriction regarding which orders can be marked as Void. If an order has been Partially or Fully Picked with Skustack, you will not be able to void it, as that would cause inventory discrepancies in the related Bins. To void such an order, you should first Unpick the quantities with Skustack and then go back to Sellercloud to change the order status. 
Fix
November 3, 2023