Hello Abdulla,
please use the search function to find possible impacts on renaming of a user-ID (...variants, jobs,application specific settings lost,etc).
In current releases the renaming function has been disabled in su01 anyway, so you need to use the copy function then. In general its better to avoid a renaming.(even after marriage/divorce - rather change only the last name but do not touch the user-ID)
b.rgds, Bernhard