When calls to other functions are encountered, you can step into an OPM program if it has debug data available and if the debug session accepts OPM programs for debugging.
If the ILE source debugger is not set to accept OPM programs, or if there is no debug data available, then you see a blank Display Module Source display with a message indicating that the source is not available. An OPM program has debug data if it was compiled with OPTION(*LSTDBG).
The default step mode is step over.
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