Useful Links:
https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/dual-write-overview
https://community.dynamics.com/365/financeandoperations/b/faisalfareedaxlibrary/posts/the-dual-write-implementation---part-1
http://daxture.blogspot.com/2020/07/the-dual-write-implementation-part-1.html
https://community.dynamics.com/365/financeandoperations/b/faisalfareedaxlibrary/posts/the-dual-write-implementation---part-2---understand-pre-requisites
http://daxture.blogspot.com/2020/07/the-dual-write-implementation-part-2.html
https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/connection-setup
http://daxture.blogspot.com/2020/08/the-dual-write-implementation-part-3.html
https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/enable-entity-map
https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/customizing-mappings