When a run-time error occurs in a SAS/IML module, the program execution pauses inside the module environment. The SAS Log contains error diagnostics with a full traceback that can help to locate the problem. In the case of a loaded module, the traceback includes line offsets instead of the absolute SAS Log line numbers. The offsets can be used to track the problem into the source code that defined the module. The START statement at the beginning of the module definition always has an offset value of 1.

Offsets apply only to loaded modules. For modules that are explicitly defined in any given session, absolute line numbers are used in the traceback.