You have defined the lot size range of an alternative BOM in the BOM header.

The order quantity uses the lot size according to the chosen lot-sizing procedure as a reference.

During the planning run, the system checks whether a valid alternative BOM exists for the order quantity (lot size) in the planned order. The valid alternative is exploded and dependent requirements are created for the components.

If the system does not find a valid or appropriate alternative for the order quantity, an exception message is created.