adding to Tim's comments:

you can return an arbitrary error code from on backup startup / shutdown

http://doc.4d.com/4Dv16R4/4D/16-R4/On-Backup-Startup-database-method.301-3316874.en.html
http://doc.4d.com/4Dv16R4/4D/16-R4/On-Backup-Shutdown-database-method.301-3316859.en.html

which should logically exclude predefined error codes,
but even then, you are not prohibited from using a certain range.

http://doc.4d.com/4Dv16R4/4D/16-R4/Error-Codes.200-3316679.en.html

2018/02/02 18:36、Alan Chan via 4D_Tech 
<4d_tech@lists.4d.com<mailto:4d_tech@lists.4d.com>> のメール:
Could anyone tell if 4D changes error code range reserved by 4D?



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