In the expense rules, you can create a rule based on the amount per night by choosing the condition 'amount' where you have the option 'per night (check-in/out-dates)'
To create a rule based on the amount per night, here are the steps.
1. Go to Admin > Expense Rules and Click + Add expense rules.
2. Click Add Condition and Select Amount from the drop-down list
3. Add your nightly amount limit and select per night (check-in / out dates).
Optional: You can set this rule per attendee and country.
4. Set rule actions
Show warning in expense
When the conditions you set are met, the system will show a yellow warning at the user's expense.
Auto approve or control
Expenses will automatically be approved and/or controlled.
Create counter expense
The system will create a negative expense.
5. Enter the rule's name and brief description. Set the status to active and click Add expense rule.
Did you know that you could include the total amount a user already spent per day/week/month/year in a rule warning? Check the article below:
To require the check-in and check-out date. See the below article.