INVALID_FIELD_FOR_INSERT_UPDATE

The request tries to write to a field that cannot be written. The message reads Unable to create/update fields: <field>.

Common causes

• The field is a formula, roll-up summary, auto-number or system field.
• Field-level security makes the field read-only for the user.
• A master-detail field is being changed and reparenting is not allowed.
• Audit fields such as CreatedDate are included without the right permission.

How to fix

• Remove the field from the mapping or payload.
• Grant edit access to the field through a permission set.
• Enable “Allow reparenting” on the master-detail field if children should move between parents.
• To load audit fields, enable “Set Audit Fields upon Record Creation” and assign that permission to the loading user.