read only field in data manager
if we set a field permission as read only in console.
in data manager this field will be read only.
in import manager during process of import will this field be receiving value or it will be read only
Once you make a field read only in console, it cannot be editable once it comes to data manager,
However this read only option does not affect the import options and gets imported into the MDM system once you map it.
Hope it helps.