Mass Change of Specific Condition Type in PO

I have some 500 PO's maintained with condition type A for freight in the PO item conditions. Now there is a requirement to replace Condition Type A with  a new Condition type B.

The value remains the same, but the old condition type A will no longer be in use.

Is there a way where we can update the condition type from A to B in all open PO's without any change in the value.