On import, the business logic in D365 FO calls the ModifiedField method. This method can set or change other values. If the field mapping sequence is not right, it can reset values which are just imported.
You can modify the sequence of the fields in the mapping. The sequence is important if you:

• Import data.
• Exchange data between D365 FO environments.

Standard procedure

1.	Click Connectivity studio Integration Design.
2.	On the Message tab, in the list, find and select the desired message.
3.	Click Edit.
4.	In the Mapping section, in the Target record pane, in the list, find and select the desired target record.
5.	On the Mapping tab, on the Field mapping tab, in the list, find and select the desired field mapping.
6.	Click Move up.
7.	On the Mapping tab, on the Field mapping tab, in the list, find and select the desired field mapping.
8.	Click Move down.
9.	Close the page.

Notes

You can use the tracer to investigate if the field sequence is right. To use the tracer, run the message manually, and on the Run the message dialog, select the Use tracer check box. When the message run is finished, open the tracer: On the Message form, on the ActionPane, on the Operation tab, in the test group, click Tracer.