Meaning of Warning Message

Dear all,

I have an INCLUDE, say the name is "Z_INCLUDE". I have included it in a program, say the program name is "Z_REPORT". When I perform syntax check in ABAP Editor, the following warning message appears for every single subroutine in Z_INCLUDE.

-

Include Z_INCLUDE

There should only be definitions in the TOP include (or nested includes within it). This means that any sort of implementations (CLASS... IMPLEMENTATION, FORM..., FUNCTION) is not meaningful.

-

01. What does the warning message mean?

02. How do I get rid of it?

Thank you in advance.

Regards,

Goh Tiam Tjai