Hi,
In <CNTN01> eventually function module SWC_ELEMENT_GET is used to retrieve the data from the parameter.
So why not place a break-point there (it is a system program, so use /HS instead of /H). I'm guessing depending on the data declaration of p_abc it will retrieve the first entry.
To answer your question you have to make some tests, we have given you the tools to make those tests.
Kind regards, Rob Dielemans