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CHGSRVA PTFINSTYP(*DLYALL)
This is not a System Value, but it is the function requested. The CHGSRVA command is shipped with authority public *EXCLUDE so users must be QSYS or QSRVAGT to be able to use it.
IBM Power Systems Development - PTF Support
I looked in CHGSRVA and I do not see an option for what the original author was requesting. It looks like the help documentation is wrong.
If you view the help on this screen it says
To change the default value, use the Change Service Attributes
(CHGSRVA) command and specify a new value on the PTF install type
(PTFINSTYP) parameter.