MVSFORUMS.com

[danm]

I invoked ISRDDN and enter F(ree) next to a DDName:

[superk]

Must be a site-specific restriction.

On my system, I can FREE and ALLOCATE both SYSEXEC and SYSPROC all day long without ever exiting ISPF.

[Maton_Man]

I would guess that this is dependent on whether these datasets are allocated in your logon JCL or whether you allocate them later in a logon CLIST/Rexx. If they are in your JCL then that is why you can't free them.
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My opinions are exactly that.