If you specify both the PROG=xx and the APF=xx parameters, then the system places into the APF list the libraries listed in IEAAPFxx, followed by the libraries listed in the PROGxx member or members.
The system will process IEAAPFxx and PROGxx parameters if both are specified. If you decide to use PROGxx only, convert the format of IEAAPFxx to PROGxx and then remove APF=xx system parameters from IEASYSxx and IEASYS00.