There's a few options here depending on the business need (just replying with one solution for now):
If the Contracted Price will always supersede the price rule(s):
- Add a 'Price Condition': [![Price Condition for Price Rule][1]][1] [1]: https://i.sstatic.net/SUQo3.png
- This will ensure the Price Action will only fire if the 'Contracted Price' (API: SBQQ__ContractedPrice__c - Quote Line) is blank.
I'll stop there for now in case that resolves the issue but this is highly dependent on the complexity of the CPQ configuration.
Let us know if that helps.
Rob