Writing files

When new files are written, the character set of the work file is written to the catalog.

In compatibility mode, when a file is closed after being written, the work file's character set, i.e. the current EDT character set, is entered in the catalog.
The exception to this rule is that EDT does not modify the catalog entry if the file has the character set *NONE and the current character set is EDF03IRV. In this case, the value *NONE is retained.