Explanation
The system message that is shown when a user creates a purchase order with a delivery date in the past can be controlled by copying it to a new version and setting it as an error message or a warning message. To allow such purchase orders to only be created by authorized users, the version with the error message must be assigned to non-authorized users with user parameter MSV. This way, non-authorized users will not be able to save or post such purchase orders, while authorized users will only receive a warning message that they can ignore. The other options do not achieve this, as they either assign the wrong version to the wrong users or do not set the message as an error message.References: [SAP Help Portal], [SAP Community]