19043: Field definition name already exists

This error is returned when a request attempts to create or rename a custom field definition to a name that is already present for the account. Field definition names must be unique. Field definition name values are enforced as case-insensitively unique in the SendGrid Marketing Campaigns API, which manages custom field definitions.

• The name supplied in POST /v3/marketing/field_definitions matches (case-insensitively) an existing custom field definition.
• An update via PATCH /v3/marketing/field_definitions/{custom_field_id} attempts to change name to one that already exists.

• Choose a unique name value; uniqueness is case-insensitive, so avoid names that differ only by letter case.
• List existing definitions first with GET /v3/marketing/field_definitions and verify that the desired name is not already present (including case-insensitive matches).
• If you intended to modify an existing definition, update it using PATCH /v3/marketing/field_definitions/{custom_field_id} rather than creating a new one.
• If you must replace an existing definition, remove it with DELETE /v3/marketing/field_definitions/{custom_field_id} before creating a new one (only custom fields can be deleted).

• Create Custom Field Definition
• Get All Field Definitions
• Update Custom Field Definition