Expense Report with reserve fund , after cancel invoice system not budget refund.

Expense Report with reserve fund , after cancel invoice system not budget refund in Authorization Commitments , following step

1. I create Request Authorize request with Reserve fund 10,000 baht, the system reserve fund in Authorization Commitments 10,000 baht.
2. After that, the Expense report transfer to AP invoice ,the system add value to Payable Expenditure and reduce the value in Authorization Commitments to zero.
3. Then I canceled invoice, the system reduce the value in Payable Expenditure but not reduce the value in Authorization Commitments (still show 10,000 baht).

This is bug?