Modifying OBN Business Objects from ERP Common Parts

Hi All
I've created an application in which I need to trigger OBN navigation to the SAPGUI transaction for creating Materials (MM01). We have the "ERP Common Parts 1.41" business package installed on our Portal and I was hoping to use the standard OBN business object for Material however, strangely, there is no operation for "Create".
Question: Is it a good idea to add my own "Create" operation to the standard ERP Common Parts business object? I'm worried that every time we patch or upgrade the Portal, my custom operation will be wiped out...
Thanks!
Glen

Thanks The-Hung!
That was my opinion too, so I'm glad to have a someone back it up.
I still have a problem with the Material business object though. How would you suggest I should handle the problem with the missing "create" operation? Should I create a second business object (eg. "material2"?) and use the second object for material creation only - ie. only add a "create" operation? I don't want to have to rebuild the whole object in case we implement standard functionality that triggers the standard business object "material"...
The reason I'm asking these questions is that I'm an ABAP developer and it just seems unusual (and very restrictive) that I can't just enhance standard functionality without worrying that it will be deleted in an upgrade... I guess I'm hoping there are some tricks in the Java stack world that I don't know about yet.
Cheers
Glen

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Modifying OBN Business Objects from ERP Common Parts

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