Terms and Conditions are an agreement regarding commercial actions between you and your supplier/vendor. This agreement may specify the terms of delivery and payment, credit periods and payment types, the risk of loss, etc.

To add Terms and Conditions to POs: 

1. Open the Configuration module on the left-side menu -> go to Basic Settings --> open the Purchase Orders tab.

2. Click the button "Add Order Terms and Conditions" and attach the necessary document/s. 

3. Don't forget to press the Update button to save any changes!

You can add several documents and choose the one to be attached while creating the PO which could be helpful if you have different terms for a specific supplier or if the payment terms differ from one supplier to another.

The Terms & Conditions will be attached to your pdf PO as a 2nd or 3rd page of the document.

Here is the example: