Travel request did not generate allowance

Hi

I am testing workflow for travel request with expense rule, that for employee who stay overnight will receive allowance. But when I create travel request option, it did not generate allowance automatically.

Test case (1. Cloud version2. using IFSAPP account)

1. create expense rule with allowance, allowance code for domestic amount 1000 THB
2. Travel request config set with “no approval”
3. Assign this rule to employee A
4. Employee A create travel request need to stay overnight and create other expense such as Taxi Fare and then click create request
5. System create Option 1 status Registered with expense of Taxi Fare only. 
6. When I click deduction and addition, system show pop up message “Travel does not generate allowance”.  I thinks allowance should be generated automatically