How To Fix TL052 - File T002 not in language directory: Switch to old name

SAP Error Message - Details

• Message type: E = Error

• Message class: TL - Messages for language transports

• Message number: 052

• Message text: File T002 not in language directory: Switch to old name

What causes this issue?

The language files have a new naming convention from 4.0:
<(><language><ISO code><file ID><)>(.C), where
file ID can be = TX (DE + Customizing data)
= DC (Documentation)
= FO (Forms)
= SL (Styles)
= RW (Report Writer)
= MS (Master file)
If the files were written aftrer the new naming convention there is a
file T002 in the language directory.
Names must be converted because 4.0 allows lower-case language IDs and
the System interface language display format uses the 2-character ISO
codes.

System Response

The file T002 was not found in the language directory.
The language transport tools assume that the files were written using
the old naming convention.
These files can be imported without difficulty if all the language
import conditions are fulfilled (release, etc.)

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.