User Exit for Infotype 0001
can anyone help me find the user exits for infotype 0001. I am using prgram (screen) MP000100. I have tried finding a function module with name EXIT_MP000100_nnn, but with no result. Using function module RS_GET_ALL_INCLUDES returns no relevant includes. Finally, entering the source code and searching for "customer-exit", "user-exit", "zx" returns no result.
Any help is greatly appreciated.