Hi @Paulsylo 
Addressing CMDB (Configuration Management Database) data accuracy issues, especially for billing based on resource usage (RU), requires a multi-faceted approach focusing on data quality, process standardization, and continuous improvement. Here’s how you can address these challenges:

- Establish CMDB Governance: Create a governance body or committee that includes representatives from all stakeholders, including those from client-side. This body will define, enforce, and regularly review CMDB standards, policies, and procedures.
- Define and Document Best Practices: Clearly document all processes related to CMDB management, including data entry, modification, validation, and deletion. Ensure these practices align with ITIL guidelines for CMDB management.
- Scheduled Jobs and Discovery Tools Configuration: Standardize the configuration of scheduled jobs and auto-discovery tools. Regularly review their performance and accuracy to ensure they are capturing the required data correctly.
Automated Validation Tools: Implement tools that can automate the process of validating CMDB data against actual resources in the environment. This includes ensuring that only active devices are billed.
- Regular Reconciliation: Establish a routine reconciliation process where CMDB data is compared with independent data sources (like network scans, asset lists from other systems, etc.) to identify and correct mismatches.
- Data Quality Metrics: Define key metrics to measure the quality of CMDB data. These could include accuracy, completeness, timeliness, and consistency. Regularly review these metrics to identify areas for improvement.
Change Management Integration: Integrate CMDB management with your IT service management (ITSM) change management processes. This ensures that any change in the IT environment is reflected in the CMDB promptly and accurately.
- Comprehensive Documentation: Ensure comprehensive documentation of the CMDB, including the data model, relationships among CI (Configuration Item), and the rationale behind the organization of this information. This will aid in resolving discrepancies and improving understanding among stakeholders.
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Thanks & Regards 
Deepak Sharma