Update Valuation price in Purchase requsition called from Sales Order

Hi,

While creating a Sales order PR transaction ME51 is called.

If the valuation price is 0 and if Value of Purchase Organization is '01AE' then I need to make the price as 1.

I tried but I could not find any Customer Exits.

Could any one help me on this issue

My system Version is 4.6C.

Edited by: SAP LEARNER on Sep 8, 2010 1:19 PM