I know this might be silly question but I am trying to upload at least 500 Partner Accounts using data loader and want to enable all of them as a Partner Account. While I try to do using data loader, it gives me an error for IsPartner is not writable.
Is there a way I can mass enable them as a Partner User using Data Loader or setting this flag to true in before insert trigger and upload them? Doing this manually would be too much.