Although PowerCenter allows you to use any supported code page, there are risks associated with using incompatible code pages for sources and targets. If your target code page is not a superset of your source code page, you risk inconsistencies in the target data because the source data may contain characters not encoded in the target code page.
When the PowerCenter Integration Service reads characters that are not included in the target code page, you risk transformation errors, inconsistent data, or failed sessions.
If you relax code page validation, it is your responsibility to ensure that data converts from the source to target properly.