Are you having problems resolving cases after CRM 2011? The key is in the error file, it states Allotment overage is invalid.
This leads to the contractbase. When this data is upgraded from CRM 4 the values are NULL. CRM 2011 does not want the null value. Simply update the existing contractbase using the query below:
update ContractDetailBase set AllotmentsOverage = ISNULL(AllotmentsOverage, 0);
All new cases after the upgrade will not be effected! Enjoy!