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Internationalizing Applications
Using Multi-byte Code Pages : Issues specific to multi-byte code pages : Valid and invalid code-page conversions : Determining valid code-page conversions (for non-Unicode databases)
 
Determining valid code-page conversions (for non-Unicode databases)
You can convert data from one code page to another if one of the following conditions is true:
*Each symbol of the source code page appears in the target code page
*Each symbol that appears in the data appears in the target code page
If OpenEdge is converting from UTF-8 and encounters a character that does not exist in the target code page, OpenEdge substitutes the question mark (?).