Error:

“Attempt to de-reference a null object” while amending migrated contracts/subscriptions.

This is the classic CPQ issue when legacy contract/subscription data is missing required fields.

Subscription Start / End Dates

Quantity

Price fields

Billing Frequency

Term

Amendment-related fields (AmendmentStartDate, etc.)

Subscription Product

Related Order Product

Related Asset (if asset-based)

During amendment, CPQ expects:Missing or incorrectly populated fields cause CPQ code to attempt to reference null values → null pointer exception.

Thus:

✔ C. Required fields are missing or incorrectly populated

Why the other options are incorrect:Option

Why Incorrect

A. Migrated contracts cannot be amended

False. Salesforce explicitly supports amendments on migrated data if fields are populated correctly.

B. Asset-based renewal required

Not required—CPQ supports quote-based and asset-based renewal models.

D. Missing lookup to source Quote Line

Not required for legacy subscriptions; CPQ amendments work without source quote lines.

Thus C is the only valid root cause.