There are many ways to implement integration with Dynamics 365 for Finance and Operations. The file-based approach is probably the oldest and most commonly used integration type. Using this approach, an external system and D365FO send messages by reading/writing files into some shared network folder. It has the following advantages: Very clear responsibility (you either have a file in the correct folder or not); It is easy to troubleshoot (you can view the file, can modify it, etc..); There are a few reasons behind failing files(CSV) to import before staging in the DMF process. Primary Index at staging table This is the most common issue we will reason behind failing data behind staging, to fix this issue either make sure we have corrected our import data based on the Table index structure we designed to import data or modify Index as per the incoming XML file. File format issues The Other reason could be due to the file having incorrect/ in proper d...