How do I change an RMAN script within an OEM 13c database backup job?

If I have an OEM 13c database backup defined and discover that there is a typo in the RMAN script I edited, how may I fix my syntax?

Per my investigation, it appears the OEM tool will not let me directly edit my job’s script, but rather than deleting a job and rebuilding an exact copy—with a non-standard name since I already created it once with the correct name—might I be able to use SQL to update the text directly inside a single row of a SYSMAN table? What tables would need to be touched to add a whole new line of RMAN script? What tables would be needed to drop a line of an RMAN script?