ABAP_to_the_Future

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The Enhancement Framework and New BAdIs
6.3.3 Creating the BAdI Interface
The last Russian nesting doll to create in the BAdI definition is the interface for
the BAdI—that is, what methods BAdI implementations are going to have and
what parameters and exceptions those methods have. To create this interface,
click on the arrow on the left of the BAdI definition, and double-click the Interface
icon in the tree that pops up.
Figure 6.19 Creating a BAdI Interface: Part 1
Most developers are used to SE11 or SE38 or SE24 for creating various repository
objects in which the icons are arranged in the order Display, Change, Create. To
keep you on your toes when creating the BAdI interface, the first two options are
reversed to Change, Display…and there is no Create option in sight (Figure
6.19). What you need to do is cr eate the interface by clicking the Change icon,
after which you are asked if you want to create the interface. Then, you’ll end up
at the standard SE24 screen (Figure 6.20).
Figure 6.20 Creating a BAdI Interface: Part 2
This is exactly the same as defining a normal interface, with the exception that
multiple-use BAdIs can only have importing and changing parameters. This is
because they are called in a random order, so exporting or returning parameters
make no sense, because only the last implementation called would be meaningful.
You’re now finished with the definition of the BAdI (rather like saying you
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