All rules that call the REXX program must be disabled and re-enabled to use the new code.
An alternative to avoid this problem in the future is to dispatch the REXX program to run on an OSF server.
Instead of using the "CALL" REXX instruction use the "ADDRESS OSF OI" statement to call the program:
ADDRESS OSF "OI PROGRAM(pgm-name)",
"ARG("arguments")"