EXIT_SAPLKAEP_001 is a standard SAP function module that performs Line Item Reports in Actual: Customer-Specific Fields in Display Variant functionality. This is available within standard R/3 SAP systems depending on version and release level.
Below are the pattern details for this FM showing its interface including any import, export and tables parameters. There is also a list of Exceptions and for your convenience any standard documentation available. All this information and more can also be viewed if you enter the function module name EXIT_SAPLKAEP_001 into the relevant SAP transaction such as SE37 or SE80.
CALL FUNCTION 'EXIT_SAPLKAEP_001' "Line Item Reports in Actual: Customer-Specific Fields in Display Variant EXPORTING i_rep_object = " tkalv-rep_object CHANGING cs_record = " kaep_covp_ext . " EXIT_SAPLKAEP_001