Storage accounting area has 2 formats - 4 bytes or 8 bytes. Some subpool has a duplicated saa ar the end of the storage area. The saa at end of the storage is used to detect storage violation when the task write beyond the requested area. The saa contain a byte value that is stored see to initialize the storage.
The 8 byte format contain extra field that chain up the next area belongs to the same task subpool under the control of CICS (less susceptible to storage violation)uses 4 byte saa
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