Required Edition / Module: Pro Edition or Multi Location Module

Create Location for Supplier
Go to Stock > Stock Location Maintenance

Create a Stock Transfer when send items to Supplier as Warranty Claim
Go to Stock > Stock Transfer > Create a new Stock Transfer
Location From: HQ
Location To: Supplier

Scenario #1: Supplier replace a new item without bill or with Non-Accounting Bill

Create a Stock Transfer
Location From: Supplier
Location To: HQ

Scenario #2: Supplier replace a new item with invoice and CN the spoiled item

Create Purchase Invoice, Location: HQ
Create Purchase Return, Location: Supplier

Scenario #3: Supplier CN the item only

Create Purchase Return, Location: Supplier

Scenario #4: Supplier rejected the claim

Create Stock Adjustment with Negative Quantity to reduce the stock from Supplier Location.