Any automatic Update the stock in existing sales orders .

Hi

I have created four sales orders , in those orders stock is not available . So that system has given confirmed quantity is zero.

Now i have posted the stock using different source either MRP RUN or MB1C.

Then the stock is available.

My requirement is with out using resheduling or back order process or Manual changes in the sales orders.

Upadate the stock in the existing sales orders that means system confirmed the stock after stock is available in the plant , is there any standard programes available to run to update the stock or any special procedure.

Thanks,

KP