abapOpenSource is an open source project which provides extra checks for Code Inspector/ATC, a lot has happened since it was initially released 3 years ago. The number of checks has increased from 26 to 69, and a lot of false positives been removed from the results. All checks have different use cases and vary in quality. I recommend trying it out, the checks are widely configurable, and it is possible to cherry-pick the most useful checks.
All your prefixes
The latest check “Naming Conventions” can check prefixes for variables in ABAP and report the findings to the developer.
When reporting findings, the check reports the expected prefix so the developer will not have to look up the conventions or the type of the variable,
As part of the check configuration, it will by default ignore most of the naming in exception classes, as it sometimes is not possible to have these follow the conventions. Also, special function module signatures are ignored, like conversion exits where the parameters are always INPUT and OUTPUT,
Overall it should report less false positives, and if there are false positives, it is possible to inherit from the check class and implement custom rules or give back to the community via a PR on GitHub.