I need to "compress" 16-byte STCKE format TOD into a 12 byte field without 
losing the sysplex-wide uniqueness.

So, I thought I'd keep the first 10 bytes and the last 2 bytes [Programmable 
Field].

To my surprise STCKE returns non-zeroes in the bytes #13 and #14 -

                                           ????
00C3CD5B F16F38C5 A8000000 01040002

Could someone explain what are these 2 bytes for?

Also, how save is the assumption that the field can be compressed into 12 
byte without losing its sysplex-wide uniqueness.

TIA,
-Victor-

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