Hitachi Energy
The Identifier
The last line in an error message identifies uniquely an error. The identifier is build from its type and a number.
The Error Type can be:
APP for Applicative errors.
APPSYS for errors that can be Applicative or System. Its type depends on who asked for the command, the user or an internal process.
SYS for System errors.
INT for Internal errors.
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Please note: 
The Error Number is specific to each message and facilitates the communication between the support and the user.
The Error View