Hi, I work on a Cobol As400 system. I am changing a lf to make it unique instead on non-unique. Do I need recompile the pf or just the lf and any programs that access it? I have changed the lf and the i/o module that accesses it, tested it, and so far so good. However the process here is to recompile the pf and and all logicals and all programs that reference them in order to be absolutley certain to avoid problems.