a small but interesting question regarding foreign currency valuation

hi

current sap implementation logic: when we execute foreign currency valuation, firstly one valuation document is created, right following the valuation document, the reversal document is created to reverse the first document, they will appear in pairs. And after this pairs, another pairs of documents are created, and so on.

I am interested to know that whether we can change the sequence of document generation, like firstly, all of the valuation documents, then all the reversal documents.

Or I want to check whether we can do like that: first, I can execute the foreign currency valuation with no reverse, then I execute the transaction again to just reverse all the valuation documents.

Thanks very much in advance.

best regards, Lawrence