Colleague has the same 'Admin' profile as me.
If I try to update data via the data loader I see all fields, if he tries he can not see the custom object id but can access the object?
Note this is not an external ID or anything. I have read about fields not on layouts wont show but this is the ID which to my knowledge cant be added to layouts anyway. Also I am unaware of any field permissions regarding record ids either.
UPDATE: So I go
However my colleague does not see the ID in the top section IE the available SF fields to map to.
Any suggestions thanks?
Admin
profile a System Administrator profile or a custom Profile. If the latter, you may have a permission set that extends Update access to this Object whereas your colleague does not. Check CRUD permissions for profile Admin