Thanks Vinay.It's actually the combination of the DTAARA keyword plus *AUTO.
Both the PDF and the online documentation for 7.4, and what you said, are misleading. They appear to state the the *AUTO parameter of the DTAARA keyword is what makes it a data area data structure, but in fact it is the DTAARA keyword that does that, not the *AUTO parameter. The PDF is particularly bad in that it does not explain what the *AUTO parm actually indicates.
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