> ## Documentation Index > Fetch the complete documentation index at: https://docs.utilified.com/llms.txt > Use this file to discover all available pages before exploring further. # Validation > Automatically check processed invoices in UMS against validation rules to surface billing errors, anomalies, gaps, and data quality issues for review. Invoice Validation automatically checks processed invoices against a set of rules to identify errors, anomalies, and data quality issues. Validation isn't a separate menu item. You'll find it on the **[Invoices](/invoices)** page: the **Dashboard** tab (health overview, gaps) and the **Review** tab (flagged invoices). Per-invoice results live on the **Review** tab of each invoice's detail page. UMS validation dashboard showing pass rates and quality stats ## Validation dashboard The **Dashboard** tab of the Invoices page provides an overview of validation health. ### Summary stats * **Total Validations** — Number of invoice validations run * **Passed** — Invoices that passed all validation checks * **Failed** — Invoices that failed one or more checks * **For Review** — Invoices flagged for manual review ### Overall pass rate A percentage badge showing how many invoices passed validation. ### Common errors (last 30 days) A breakdown of the most frequent validation failures to help you identify systemic issues. ### Supplier performance (last 30 days) Shows how different suppliers perform against validation rules — useful for identifying problematic suppliers. ### Tolerance analysis Configuration for validation tolerance settings, including the period (in days) used for analysis. ### Invoice quality * **Total Gaps** — Number of detected invoice gaps across all connections * **Open** — Gaps that have not been addressed * **Acknowledged** — Gaps that have been noted but not resolved * **Resolved** — Gaps that have been closed Buttons to **Trigger Gap Detection** and **View All Gaps** are available at the bottom. ## Validation results UMS validation results tab showing pass and fail outcomes per invoice Detailed pass/fail results for each validated invoice, including confidence scores and error sources. ## Review items UMS review items tab listing invoices flagged for manual review Invoices flagged for manual review — tariff mismatches, data quality issues, and validation failures with severity levels and recommended actions. ## Invoice gaps UMS invoice gaps tab showing missing invoices detected by gap analysis Missing invoices detected by gap analysis across retail accounts and connections. ## Inbox review UMS inbox review tab for triaging email-sourced invoices Inbox items requiring validation review, with status and type filtering to manage email-sourced invoices. For a detailed guide on completing reviews and excluding invoices, see [Invoice Validation and Review](/guides/invoice-validation).