Muli align the claim framework to the Head contract Structure, when you have a fixed price or Lump Sum Contract. Then you need to create the schedule of claimable components equal to the original contract value. P.S the last item would be the value of Prime Cost and Provisional Sum. This is then followed by the variation schedule showing the value of the highest status of each item; Ballpark, Submitted, Approved Claim.
Note: Every claim includes a full variation summary including expected total payment at completion, This regular detailed constructional summery being conveyed to the client makes a very useful legal support document.