Updating PO Charge Account for Expense Items

Hi -

I've seen similar discussions on this topic, but have not seen a clear cut answer.  We have a new business requirement to be able to update the Charge Account on Requisitions for Expense Items.  In other words, users want to be able to place an Expense Item on a Requisition and then proceed to Distributions and manually override the defaulted Charge Account.

Does anyone know of any configurations, solutions or workarounds to allow this?

Thanks in Advance