Creating Contract Approvals based on deviations

Summary

Would like to create an approval rule based on if contract has deviations from the terms template.

Content

I am trying to to build the following rules for contract approvals:

1. If authoring party is External then route for legal approval (Working)
2. If authoring party is Internal with no deviation and estimated amount < $25,0000 then auto approve (Error occurred while displaying History tree table. Error in task {0}. Please correct the error.)
3. If authoring party is Internal with deviations and estimated amount < $25,000 then route for legal approval (Error occurred while displaying History tree table. Error in task {0}. Please correct the error.)
4. If authoring party is Internal and >$25,0000 route for legal approval (Working)