Subsidiary hierarchy

The V4 subsidiary API and MCP subsidiary tools can now return hierarchy IDs:

• parent_subsidiary_id is the direct parent's ID, or null if the subsidiary has no parent.
  It appears in list and retrieve responses.
• root_subsidiary_id is the configured hierarchy root's ID.
  It appears in list responses, even when the list is empty. The root can differ from the default subsidiary.

Both the hierarchy feature and hierarchy API support must be enabled for your organization.
Otherwise, these fields are omitted.
Parent and root IDs can refer to subsidiaries you cannot access.
Your permissions still control which subsidiary records you can read.