Dual-write

Dual-write is the synchronous integration framework that connects Dynamics 365 Finance and Supply Chain Management (which run on their own database) with Microsoft Dataverse (which underlies the CRM-side D365 apps and the Power Platform). It defines maps — pairs of tables, one in F&O and one in Dataverse, with field-level mappings — and synchronises records near-real-time on save. Microsoft ships dozens of standard maps for customer, vendor, product, sales order, and other key entities; custom maps extend them. Direction can be one-way or bi-directional. Dual-write is the standard pattern for customers running F&O alongside CRM-side D365 apps, and a configuration discipline rather than custom code.