How do we make message JMR035I scrollable on the console?

Document ID : KB000094793
Last Modified Date : 04/05/2018
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Question:
How do we make message JMR035I scrollable on the console? 
Answer:
In the SYS1.PARMLIB(MPFLSTxx) member you can specify the following for the JMR999I message

JMR999I,RETAIN(NO)