I believe that HKID is a data identifier in the system, am i correct?
Since I don't believe changing data identifiers is possible, I would recommend one of the following actions:
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create an "AND" policy which suggests that if a string like "X" and "A123456(7)" was found than trigger an incident
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create a new data identifier using the data identifier API
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create a regular expression that checks for the mathematical string you are looking for
Kind Regards,
Naor Penso