Keeps the old pages from a transaction. 
Syntax:
CSPG messchnyyyy [parameters]
 
Parameters:
| 
messchn
 | 
The defined message-chaining transaction identification code for your installation. | 
| 
yyyy
 | 
The identifier of a transaction that produces data to be added to the message chain. | 
| 
parameters
 | 
Any parameters transaction yyyy needs. |