When a number looks wrong
Where. Start at Finance › Parent invoices. Then System › Audit logs and Email log
Check drafts against sent invoices first. Drafts are excluded from Outstanding.
Look for a schedule change or closure the true-up already plans to settle before touching anything.
Use the audit log to see who changed what, and the email log to confirm what a family actually received.
Do not fix billing by hand until you can explain the difference. Most of the time the system is mid-correction, not wrong.