Trying to call the package exit for two actions and it is not working as expected.

Document ID : KB000015912
Last Modified Date : 14/02/2018
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Question:

After writting a package exit that has two functions:  Create package and Modify package,
the modify is not working as expected.

Answer:

The first action is a CREATE PACKAGE and the second is a MODIFY PACKAGE.  What this means is that
in order to have the second action called the exit needs to register for the PECBMBBE - 'before modify build' and PECBMBAF - 'after modify build' exit points in the package setup.