I_STEP = 0. This step is not called during report execution but when a report variable is used in other instances such as InfoPackages and authorizations.
I_STEP = 1 - Called prior to processing of variable pop-up and for each “customer exit” variables. Can be used to fill variable with default values. Function module EXIT_SAPLRRS0_001 is called with I_STEP = 1 in function module RRS_VAR_VALUES_EXIT_BEFORE
I_STEP = 2 - Called after the processing of the variable pop-up.
Only for those variables that are not marked as “ready for input” or are set to “mandatory variable entry”.
Function module EXIT_SAPLRRS0_001 is called with I_STEP = 2 in function module RRS_VAR_VALUES_EXIT_AFTER
I_STEP = 3 - Called after all variable processing and gets called only once and not per variable. Here you can validate the user entries. Function module EXIT_SAPLRRS0_001 is called with I_STEP = 3 in function module RRS_VAR_VALUES_EXIT_CHECK
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