Comprehensive Detailed Step-by-Step Explanation with all Salesforce CPQ References

Understanding the Issue:

The error message, “Product cannot be refunded. The quantity of Line # cannot decrease without a corresponding update,” occurs because the default behavior prevents a decrease in asset quantities unless explicitly allowed.

Asset Conversion for Product A is set to "One per Unit," requiring each unit to be treated as a separate asset.

Key Salesforce CPQ Setting:

Asset Amendment Behavior:

This field on the Product determines how CPQ handles amendments for asset-based products.

Setting it to "Allow Refund" enables sales reps to reduce the quantity of assets during amendment quotes without generating errors​​.

Configuration Steps:

Navigate to the Product Record for Product A in Salesforce CPQ.

Locate the Asset Amendment Behavior field.

Change its value to Allow Refund.

Save the changes.

Impact of the Change:

Sales reps can now amend the quantity of Product A on amendment quotes.

The system will process the reduction in quantity without triggering an error, as the refund behavior is explicitly enabled.

Verification:

Create an amendment quote for a contract involving Product A.

Adjust the quantity of Product A and confirm that the amendment processes successfully without errors.