When PowerExchange converts data between Unicode and a source or target code page, type 1 fallback mappings are disabled by default. That is, when the code page conversion routine encounters a character mapping with a precision indicator of 1 in the UCM file, the mapping is not executed. Instead, the conversion routine generates a substitution output character.
To enable type 1 fallback mappings, define USE_TYPE1_FALLBACKS=Y in the DBMOVER configuration file. Alternatively, you can enable type 1 fallback mappings for a specific code page by using the USE_TYPE1_FALLBACKS option of the ICUCNVPROPERTY statement in the DBMOVER file.
In a PowerExchange session, a code page conversion routine might use type 1 fallback mappings when writing data to a target. Type 1 fallback mappings are not typically used when reading data from a PowerExchange source.
Informatica recommends that you enable type 1 fallback mappings whenever you use PowerExchange to write multibyte data to a target.