Try the Sandbox
A shared workspace with obviously-fictional books, so you can click through the real system rather than screenshots of it. Access is granted by a person, usually within a business day — tell us a little about what you want to look at and we will point you at the right part of it.
What You Can Try
The system itself refuses an unbalanced entry before it can be saved. The rule is built into the foundation, not into a screen that can be bypassed.
History is never overwritten. Every record is sealed to the one before it, and a correction is a new entry that reverses the old one, so the original stays in the books.
Every company's records are kept separate at the foundation of the system, across 200+ kinds of record, not by a filter the software has to remember to apply.