Missing Data in Sales Order

What causes this issue?

The sales order data is incomplete.
Order number:,,&V1&
Order item:,,&V2&

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

Manufacturing completion cannot be carried out for the order.

Procedure for System Administrators

Internal order key:
Item GUID:,,,,,,&V3&
Internal order number: ,,,,&V4&

Error message extract from SAP system. Copyright SAP SE.