Allowing reentrant programs to be writable for fetches from 
non-APF-authorized data sets / concatenations was something that had to be 
maintained for compatibility, but was not felt to have sufficient 
justification to accommodate for "new cases".

"New cases" include loads via BPX1LOD and loads in a task that was 
attached with KEY=NINE.
Those cases do not care about the APF state of the data set / 
concatenation when determining the subpool.

The newer of those "new cases" is almost 20 years old now.

Peter Relson
z/OS Core Technology Design


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