FM split account document

Hi folks,

I'm working in a FM implementation and the client has the following scenario:

Create a Requisition > Purchase Order > MIGO > MIRO using the Fund "A", but, sometimes, they just realize after creating the MIRO that the Fund should be a different one (and sometimes, more than one Fund).

So, do you know if it's possible to make a reclassification only in FM to change the Fund or split in more than one Funds?

I'm checking the customizing for the Rule-Based Account Assignment, but I didn't have success yet.

Thanks a lot and Best Regards,

Pedro B. Gomes