Expense Report Coded for Project not generating Proper accounting

, I have a question on Project expense report

I have an expense report that is coded to Project, however when I do the create accounting after the expense invoice is created the account is not generating correctly. Can you please provide some suggestions

I have expense report coded to a Project and when expense invoice is accounted the segment 2 value which is reporting unit is taking from my default expense account value instead of the Project type. There is a rule to assign the segment2 value based on Project type. the rule is not firing.