In order to use the APPLEND feature, you must load a workload object module. The APPLEND workload object module is CYBESOAE. This may be loaded with the ESP OPER WOBDEF command or with the WOBDEF initialization parameter. Make sure that in your ESPPARM member you have the WOBDEF initialization parameter with CYBESOAE included into the list of active wob modules. It might looks like it shown in the following example:
WOBDEF LOAD(CYBESOA4 CYBESOUJ CYBESONT CYBESOHP CYBESODT + CYBESOPJ CYBESOSJ CYBESOSQ CYBESOAX CYBESOFM + CYBESONC CYBESOH3 CYBESODA CYBESOO2 CYBESOSP + CYBESOTA CYBESOAE CYBESOAM CYBESOOV)
This Frequently Asked Question applies to all supported releases of ESP Workload Manager.