What does the red line under the data field mean in mapping? This happens when you change your destination data layout after you have defined mapping. Mapping template does not automatically change based on your changes to data layouts. You can review the changes and either fix this by adding underlined fields into your destination data layout or accept the change and refresh the mapping template.
When this happens you will see info and error messages at the top of the mapping. Hover over the messages to get full picture of which fields are missing and which might have been added to the destination data layout.
If you are happy with your data layout and only want to refresh the mapping template click 'Regenerate map' and mapping template will automatically refresh based on your current destination data layout:
- any fields which are not in destination data layout will be removed (including mapped source fields)
- any fields which are on destination data layout but not on mapping template are added