CASTP4110 page-function is not valid. Page RETRIEVE function must be A, C, L, N, P, Q, or a number.

Explanation: The page retrieve function represented by function is not one of the following: A, C, L, N, P, Q, or a number that may be preceded by a + (plus) or a - (minus) sign, where:
A
All logical messages destined for and being displayed on that terminal.
C
The current (level) logical message.
L
The last page.
N
The next page.
P
The previous page.
Q
(Query) display the identifier of all logical messages destined for this terminal. If the message is security protected, its identifier is displayed only if the operator identifier and class for the signed-on operator match those in the message. The identifier consists of 1-to-6-digit hexadecimal number, and optionally, a message title.
System Action:
Other processing continues.
Resolution:
Use a valid page retrieve function.
Module:
dfhzcspg
Destination:
Terminal end user