On Mon, Feb 01, 2021 at 06:15:26PM -0500, Joseph Reichman wrote:
> When you have DE entry on any of these macros  I assume the system just
> checks the first name ?

The DE= points to a single BLDL list entry, not the whole list.  

manual for BLDL:

 idad500_v2r3.pdf - z/OS Version 2 Release 3
                DFSMS Macro Instructions for Data Sets
                SC23-6852-30

see pdf page 181, page 155

list diagram on pdf page 183, page 157

The list entry starts with the CL8 of the member name.

Note that program fetch (ATTACH/LINK/XCTL/LOAD) doesn't trust your DE=
information under some conditions and does it's own BLDL.

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