SAP Note 27918 - Transport of output types is incorrect (texts)

Symptom:

The following error occurs when transporting output types in object export:
Transport object TEXT OCS,xxyyyy,STAM,z is processed
E ERROR: The object does not exist or is incorrect

Cause and prerequisites

When transporting output types, an attempt is made to transport standard texts for all mail message titles (entries in table TNATI)

Solution
Check, whether the texts actually exist