CTK for TMF 648 is expecting price and priceAlteration as a first level attribute for Quote Object in response , whereas specification and conformance documents doesn't mention any direct links of price and priceAlteration with Quote. Can you please verify if this is expected ?
At least on the surface, this looks like a defect in the CTK. price and priceAlteration are properties of QuotePrice, embedded as Quote.quoteItem.quoteItemPrice
I've raised the issue with the relevant focal in TM Forum.
I understand from TMF focal that this has been dealt with.