Add functionality to open import by scenario screen and data provider screen via import scenario screen. This option will always refresh the import by scenario screen and it helps to get rid of most annoying data invalid error.
Error: Another process has updated the 'SYMapping' record. Your changes will be lost.
( this issue was raised earlier https://feedback.acumatica.com/ideas/ACU-I-1811 however it was rejected by looking at only the technical aspect of the issue. When it comes to large data imports, all consultants have to switch from import scenario and import by scenario screens many times. Problem is after an import if the logic needs to be changed then user has to refresh the screen all the time. without refreshing the screen if the user makes lot of changes and save the import scenario all the changes will be lost.)