No operation number was entered for order &

What causes this issue?

You have entered order /V1& without an operation number. However, the
system expects an order number and an operation number.

System Response

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

How to fix this error?

Specify an operation number for order &V1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.