When working on the RFQ's Responses page, click on Ref Pricing to insert or refresh any Ref ("Reference") Pricing information that was populated on the previous Assignments page. This is used to sync Ref Pricing information between the Assignments screen and Responses section.
Refreshing is recommended whenever Ref Pricing has been updated on Assignments in order to see these changes reflected on Responses.
Please review this article for more general information about Ref Pricing.