Ability to Run Script of Account Based Calculation Based on Amount

Hi Experts,

I would like to run a caluclation based on on whether a value is > or < than zero.

For example,

if Accounts Receivable is >0 (e.g. 100) do nothing

If Accounts Receivable (AR) is <0  (-25) than record 25 to the AR account and -25 to the AP account. 

Essentially reclass from negative receivable sto payables.

Issue is that I understand the script logic is limited to conditions for dimension values or properties but cannot read amounts. 

We went through this in NW, triedthe formulas provided and eventually, used ABAP to successfully perform the desired calcuation.

(See http://scn.sap.com/thread/3595642).

Anyone have relatively simple ideas for performing the calculation in the MS version?

Regards,

Eyal