PO receipt with foreing currency, create AP VO in Base Currency

I have several years working with the SL2011 version.

Now, I am having a situation wich  I can't identify the cause.
I have a purchase order generated in foreign currency. The PO receipt is made in the currency specified on Purchase Order.
Looking at the AP module,  on the screen documents and settings (03.010.00) The VO Document was generated in the Base Currency.
I was traying  to replicate it on environment of tests without success

It is a unique case in a long time

Thanks

Carlos Torre