---
updatedAt: 2026-08-19T14:56:48.000Z
agentTools:
  projectIndex: https://ae.docs.digitax.tech/llms.txt
---

# Supplier validations

Supplier validation rules follow the **same validation rules as Party**, including the same update behavior (immutable TRN, optional fields on update, merged-state cross-field checks).

* Returns `AlreadyExists` if a supplier already exists for the branch.