block actual or commitment cause by foreign exchange difference

Dear PS Expert,

i have a foreign exchange case, let's say that i have US$ 10.000, then i open PO for 1 qty with net price IDR 1.400.000 with rate 1 US$ = IDR 140.

then post goods receipt the next day with rate 1 US$ = IDR 150, my actual will be posted with US$ 9.333,33.

available budget will remain US$ 10.000 - US$ 9.333,33 = US$ 666.67, can i block this available budget not able to be created a new commitment or actual ?

Regards,

Karya