Scenario

User needs to display SKU (Display Name/Code) on their Sales Order Advanced PDF/HTML Template but would only need to display the code for Inventory Items only.

Solution

1. View Sales Order
2. Click Customize > Customize Form
3. Take note of the Print Template
4. Navigate to Customization > Forms > Advanced PDF/HTML Templates
5. Locate the Print Template noted in Step 3
6. Click Edit
7. Locate the Item Table and add the following snippet:
   
8. Click Save.