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BW Upgrade and Missing Function Modules

We just upgraded our BW development system from 3.1 to 3.5 with 353 content and we found out all our customer developed function modules are missing from the upgraded version. Our custom function groups are named "ZBIW" and function modules start with "ZBW*". Would this have caused any problems? Should our modules have started with "Z_" as opposed to "Z".

Any help is greatly appreciated.

Thanks

Shai

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