Which are the situations that can change an ISN for a record? For example, can an ADAORD operation substitute a record ISN?
ADAORD will not, nor will any single Adabas utility modify the ISNs.
An unload/decompress/compress/load (that’s 4 utility steps) can change ISNs if the options to retain ISNs are omitted.
An application could read the record, delete it and store it again, causing a new ISN to be assigned, either implicitly by Adabas or explicitly by user assignment.