In the previous blog post, I’ve demonstrated how to extend standard APIs by using them as a template for a new custom API that contains the customizations you want to do. While that approach works for most APIs, there are some APIs that are more complicated. I’m talking about APIs for sales and purchase documents. These APIs are special because they are not based on the standard tables Sales Header, Sales Line, etc.
Source : Kauffmann @ Dynamics 365 Business Central
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