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