Sales order for notification & already created

What causes this issue?

You wanted to create a sales order for the current notification, but
have already executed this function for notification &V1&. You cannot
enter more than one sales order in one dialog step.

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?

Save the notification. Then you can create an additional sales order
from this notification.

Error message extract from SAP system. Copyright SAP SE.