I need to populate one new custom field on Lead object in all the lead records for reporting purposes.
What I tried:
The first problem I encountered was with leads already converted. The error message looked like:
cannot reference a converted lead
In Spring'16, Salesforce released new permissions that allow users to update fields on converted leads (Release Notes).
So I activated these permissions on my custom Admin profile (Modify All in all objects). Then I tried to update a converted Lead using Developer Console (query, edit a few and click Save Rows) and it worked.
As I have to update 80k+ Leads, usign the UI/Console is discarded.
So I tried with DataLoader. I get rid off of my first error message but a new one appeared:
first error: INSUFFICIENT_ACCESS_OR_READONLY, insufficient access rights on object id: 
Then I tried Apex Script and Batch Apex; same error.
Why I'm getting a INSUFFICIENT_ACCESS_OR_READONLY error if I'm logged in as a System Administrator?
I'm missing something at this point? Maybe some other permission, or something related with teams?
I read some workarounds on the internet (delete records and insert them again) but I don´t really like them.
- I'm still unable to update leads using the Salesforce Classic UI. When I click Edit, I land on ViewConvertedLead standard page.
- OWD Sharing Setting for Leads is set to Private
Thank you all in advance.