Exit Modules 

Use

You can implement exit modules for elements or atoms if the standard mapping and conversion rules do not support your requirements. Exits can also be used to select data from additional database tables not included in the standard selection step (such as customer database tables) and therefore not made available in the source field inventory. The exit module can, however, use the same source fields as the standard mapping rules.

Activities

When you create an element or an atom, select the mapping procedure Exit module. On the Source tabstrip, you then enter the name of the exit function.

You write ABAP source code in the ABAP Workbench not in the DME Engine. The function module DMEE_EXIT_TEMPLATE can be used as a template for your exit module.