Expense report approvals using COA segments

Summary

Can we use COA segment values in expense report approval rules?

Content

I can't seem to find COA segment values in expense report approvals and I want to make sure I am not missing anything. We have a need to validate certain segment values and reject the report when those values are used without a project. We can't use a cross validation rule as the combination is valid for Projects module but restricted for manual entry.