Language &1 has been imported which does not match the system config.

What causes this issue?

The check "Language Import" looks for language transports which have
been imported with transaction SMLT. Here a language transport was found
which do not match to the current system configuration. The text data of
this transport might be destroyed during the Unicode conversion. Such a
situation can occur if language transports have been imported during an
release upgrade or a language transport has been imported correctly but
the system configuration was changed afterwards (e.g. MDMP configuration
is switched to Single Code Page configuration).

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?

Please check the language imports in transaction SMLT.
When have they been imported ? Was the system reconfigured afterwards ?
Are these translations used anywhere in the system ? Are there any
proprietary data in the system for this language ? If so, the system
configuration might be changed and transaction SPUMG should be
restarted.
If the language import was done by mistake or the data are not used
anymore, you can ignore the message. A language import can be repeated
in the Unicode system after the conversion.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.