How To Fix SO604 - Transmission in the future is only active for internal transmission

SAP Error Message - Details

• Message type: E = Error

• Message class: SO - SAPoffice: message texts

• Message number: 604

• Message text: Transmission in the future is only active for internal transmission

What causes this issue?

You want to send a document in the future, but one of the entries
in your recipient list is not an internal user.

System Response

The document will be sent to external users immediately.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.