The IF47 option suppress the generation of error 47's when processing IF expressions. This avoids errors being generated in application that attempt to compare/test substrings in an IF directive where the substring is out-of-bounds.

Without using this option, all IF directives in a converted application that refer to substrings could cause unanticipated run-time errors. Using this option eliminates the need of manually checking each IF directive during the conversion process.