Dynamic action is used to do certain action when an infotype is processed, based on the current infotype's data and any other data already available for the employee. For example inserting IT 41 data after IT 0, 1. Or insert IT 19 after IT 16 processing.
See the help text enclosed for dynamic actions.
For defaulting data for an infotype, you need adding code in one of the following:
a)In the pb (process before) part of the processing module.
b)in the infotype record maintenance module's user exit function - which uses the include LXPADU02.