iTWOcx provides you with the ability to change the value of your variation even after a Claim has been made against it.
To allow for changes to the variation amount you must change the configuration of the Variation document type.
1. Go to Configure
2. Document types
3. Select the Variation document type you wish to update
4. On the right-hand screen scroll to this section
5. Tick the "Can edit the value of Variations after a Claim"
6.