CASTP4128 pa-pf-key is undefined for page retrieval.

After a page retrieval (PR) session had been started, the operator pressed a PA or PF key for which no PR command had been defined in the SIT.
System Action:
The command is ignored. The display status bit is not altered.
Resolution:
Ensure that the PR command in question is defined in the SIT.
Module:
dfhzcspg
Destination:
Terminal end user