This is actually not security related, but we will tollerate it for a while if you are patient.
SAP is not an iPhone App.... :-)
Once you get started on ABAP you will realize that you need a few years to get really good at it.
So... while waiting I suggest that you read the forum rules (to avoid asking basic ABAP questions). To find the forum rules of engagement, you are kindly invited to make your first attempt to use the search (this is a life skill!!).
sy-subrc = 0 ?
Julius