Not present in S/4HANA. Reads and writes both fail, so anything referring to it has to be rewritten before you convert.
Table
DD06T
What it is
Language-dependent text descriptions of SQL tables from the ABAP Dictionary, one row per table, language, and version.
Module
BASIS
Fate in S/4HANA
Gone
SAP Note
2577406
Check this against the whole picture.
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