Enhancement Framework limitations

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Hi

I am enhancing an SAP program (RIAUFK20) and I want to declare global variables in the top include. When I went to add an enhancement to the end of the top include ( MIOLXTOP ), the code seems to disappear when I leave and reenter the top include. Then if I attempt to use any of the data declarations SAP throws a error message saying the variable is not declared.

Another issue I am having is that I enhance the selection screen of the program yet I cannot enhance the text elements to go along with it. Does anyone know how I can go about adding the text to the selection screen fields?

Also has anyone complied a list of the limitations on using the enhancement framework? Seems that it is a great tool but when trying to implement actual changes it is just one snag after another.

Thanks

John