--- title: Latest blog and updates | Apex Configuration Group | Mariusz Staniszewski description: Consultant at Apex Configuration Group, based in Warsaw. His background includes configuration management roles at Warner Bros. Discovery and TVN S.A., and he holds ServiceNow's Certified System Administrator, Certified Implementation Specialist – Data Foundations (CMDB and CSDM), and Suite Certification – Data Foundations Professional credentials. --- [![APEX CONFIGURATION GROUP](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/ACG-logo.png?width=135&height=93&name=ACG-logo.png "APEX CONFIGURATION GROUP")](https://www.apexconfiguration.com/) [![APEX CONFIGURATION GROUP](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/ACG-logo.png?width=135&height=93&name=ACG-logo.png "APEX CONFIGURATION GROUP")](https://www.apexconfiguration.com/) - [Home](https://www.apexconfiguration.com) - ServiceNow - [ServiceNow CMDB](https://www.apexconfiguration.com/servicenow-cmdb) - [CMDB Health Check](https://www.apexconfiguration.com/cmdb-health-check) - [CMDB Design & Implementation](https://www.apexconfiguration.com/cmdb-design-implementation) - [Managed Service](https://www.apexconfiguration.com/managed-cmdb-services) - [Automation & Optimisation](https://www.apexconfiguration.com/cmdb-automation-tools) - Maximising ServiceNow - [CMDB Health Dashboard](https://www.apexconfiguration.com/cmdb-health-dashboard-servicenow) - [CMDB Dependency Mapping](https://www.apexconfiguration.com/cmdb-relationship-table) - [CMDB Configuration Items](https://www.apexconfiguration.com/cmdb-configuration-items) - [CMDB Workspace](https://www.apexconfiguration.com/cmdb-workspace-servicenow) - [CMDB Best Practice](https://www.apexconfiguration.com/cmdb-best-practices) - [ServiceNow Discovery](https://www.apexconfiguration.com/servicenow-discovery-setup) - [Service Mapping](https://www.apexconfiguration.com/servicenow-service-mapping) - About - [How We Help](https://www.apexconfiguration.com/about-apex) - [What is a CMDB?](https://www.apexconfiguration.com/what-is-cmdb) - [Benefits](https://www.apexconfiguration.com/benefits-of-cmdb) - Resources - [Blog](https://www.apexconfiguration.com/blog) - [Contact Us](https://www.apexconfiguration.com/contact-us) [Contact Us](https://www.apexconfiguration.com/contact-us) [Contact Us](https://www.apexconfiguration.com/contact-us) - [Home](https://www.apexconfiguration.com) - ServiceNow - [ServiceNow CMDB](https://www.apexconfiguration.com/servicenow-cmdb) - [CMDB Health Check](https://www.apexconfiguration.com/cmdb-health-check) - [CMDB Design & Implementation](https://www.apexconfiguration.com/cmdb-design-implementation) - [Managed Service](https://www.apexconfiguration.com/managed-cmdb-services) - [Automation & Optimisation](https://www.apexconfiguration.com/cmdb-automation-tools) - Maximising ServiceNow - [CMDB Health Dashboard](https://www.apexconfiguration.com/cmdb-health-dashboard-servicenow) - [CMDB Dependency Mapping](https://www.apexconfiguration.com/cmdb-relationship-table) - [CMDB Configuration Items](https://www.apexconfiguration.com/cmdb-configuration-items) - [CMDB Workspace](https://www.apexconfiguration.com/cmdb-workspace-servicenow) - [CMDB Best Practice](https://www.apexconfiguration.com/cmdb-best-practices) - [ServiceNow Discovery](https://www.apexconfiguration.com/servicenow-discovery-setup) - [Service Mapping](https://www.apexconfiguration.com/servicenow-service-mapping) - About - [How We Help](https://www.apexconfiguration.com/about-apex) - [What is a CMDB?](https://www.apexconfiguration.com/what-is-cmdb) - [Benefits](https://www.apexconfiguration.com/benefits-of-cmdb) - Resources - [Blog](https://www.apexconfiguration.com/blog) - [Contact Us](https://www.apexconfiguration.com/contact-us) [Contact Us](https://www.apexconfiguration.com/contact-us) [tel:+442080588135](tel:+442080588135)[mailto:contact@apexconfiguration.com](mailto:contact@apexconfiguration.com) ![Mariusz Staniszewski](https://www.apexconfiguration.com/hs-fs/hubfs/mariusz-staniszewski.webp?width=170&height=170&name=mariusz-staniszewski.webp) # Mariusz Staniszewski Consultant at Apex Configuration Group, based in Warsaw. His background includes configuration management roles at Warner Bros. Discovery and TVN S.A., and he holds ServiceNow's Certified System Administrator, Certified Implementation Specialist – Data Foundations (CMDB and CSDM), and Suite Certification – Data Foundations Professional credentials. Posts by Mariusz Staniszewski ## [ServiceNow Reconciliation Rules: Which Source Wins](https://www.apexconfiguration.com/blog/servicenow-reconciliation-rules-which-source-wins) ServiceNow reconciliation rules decide which data source is permitted to write which attribute on a configuration item ( … [Read Story](https://www.apexconfiguration.com/blog/servicenow-reconciliation-rules-which-source-wins) [![Mariusz Staniszewski](https://www.apexconfiguration.com/hs-fs/hubfs/mariusz-staniszewski.webp?width=40&height=40&name=mariusz-staniszewski.webp)](https://www.apexconfiguration.com/blog/author/mariusz-staniszewski) by [Mariusz Staniszewski](https://www.apexconfiguration.com/blog/author/mariusz-staniszewski) 6 min read Sep 16, 2026, 8:52:45 AM [![ServiceNow CMDB reconciliation engine screen showing which data source wins when two feeds report different values for the same configuration item](https://www.apexconfiguration.com/hs-fs/hubfs/AI-Generated%20Media/Images/Reconciliation%20Rules%20in%20CI%20Configuration.png?width=720&height=480&name=Reconciliation%20Rules%20in%20CI%20Configuration.png)](https://www.apexconfiguration.com/blog/servicenow-reconciliation-rules-which-source-wins) [CMDB](https://www.apexconfiguration.com/blog/tag/cmdb) [CMDB Data Quality](https://www.apexconfiguration.com/blog/tag/cmdb-data-quality) [ServiceNow](https://www.apexconfiguration.com/blog/tag/servicenow) [CI Reconciliation](https://www.apexconfiguration.com/blog/tag/ci-reconciliation) [![APEX CONFIGURATION GROUP](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/ACG-logo.png?width=135&height=93&name=ACG-logo.png)](https://www.apexconfiguration.com/) ServiceNow CMDB specialists delivering enterprise-grade implementation, remediation, and managed services. Address: 20 Wenlock Road, London, England, N1 7GU VAT Number: 505 0347 31 Company Number: 15871442 Email: [contact@apexconfiguration.com](mailto:contact@apexconfiguration.com) [Follow Apex Configuration Group on LinkedIn](https://www.linkedin.com/company/apex-configuration-group) Services - [CMDB Health Check](https://www.apexconfiguration.com/cmdb-health-check) - [Design & Implementation](https://www.apexconfiguration.com/cmdb-design-implementation) - [Managed Service](https://www.apexconfiguration.com/managed-cmdb-services) - [Automation & Optimisation](https://www.apexconfiguration.com/cmdb-automation-tools) - [Health Dashboard & Reporting](https://www.apexconfiguration.com/cmdb-health-dashboard-servicenow) Company - [What is a CMDB?](https://www.apexconfiguration.com/what-is-cmdb) - [Benefits](https://www.apexconfiguration.com/benefits-of-cmdb) - [About](https://www.apexconfiguration.com/about-apex) - [Blog](https://www.apexconfiguration.com/blog) Resources - [Contact Us](https://www.apexconfiguration.com/contact-us) - [CMDB Diagnostic Call](https://www.apexconfiguration.com/cmdb-diagnostic-call) - [Book A Meeting](https://www.apexconfiguration.com/book-a-meeting) © 2026 Apex Configuration Group. 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