Delete PO value will increase the fund availability values or not?

Hi All

We have created the PO and trying to delete the PO, system prompt error message as u2018Payment budget exceededu2019. We have checked the budget availability and its showing balance amount is 9.78, but the PO cancellation values 328.

Rightfully, the cancellation of the PO will increase the funds availability but how come still need to increase the value inside this account?"

Kindly explain the above and provide alterative solution to resolve this case