Please elaborate around "Multi-byte character data".

Hello all.

Please let me know about writings in GG manual:

The manual says as follows:

"Multi-byte character data: The source and target databases must be logically identical in terms of schema definition for the tables and sequences being replicated. Transformation, filtering, and other manipulation cannot be used."

I could not understand the situation above. Please help!

(I used the manual of 23ai, but this writings exists any manuals of older versions.)

Does this "database" mean "database of multi-byte character-set environment" ?

Or, just saying (,for instance,) about tables having multi-byte character data?

Or, object having multi-byte character name?

Thank you and Best Regards.