Importing Data: field "source" is updated instead of filled
When importing contacts you can choose wether to skip duplicates or update them or to just fill the data that does not exist. That works fine. If the existing contact does not have a phone number and the imported data includes one, the contact will be filled. If the existing contact already has a phone number, it will remain and the imported number will be ignored.
But... ... that does not work on the data field "source".
Example:
The contact Max Example exists. The field "source" already has a content, i.e. "Newsletter-Subscription" Then we import new data from another campaign. Max Example is also in this list, with his postal adress, a phone number and a new source "Orders May 2022".
Import-Options for duplicate contacts is set to "Fill".
Duplicate will be recognized correctly, postal adresse and phone number will be added - but the source will be updated to "Orders May 22". So the information where the first data was generated ("Newsletter-Subscription") will be lost.
Question:
Is it a bug or a feature? And if it's a feature, is there a workaround to not lose the existing data?
Best regards Thomas