In MM , How i can find where the EAN code of Material changed by Workflow?

Hi,

I have Some problem In MM Workflow....

The process is:

When Ever I create a Material, At that time EAN code Generated Based on the EAN Category.After That The material will go for Approvel.... After Getting the approval, the material will go to SAP table. In between time again the EAn code is generated.. Means The NEW EAN code is generated and that value saved in the SAP table. But When i see in MM03 , in Display Changes , the Old value and new Value Displayed.. and it says changed by Work Flow?

How i can find where the EAN code of Material changed by Workflow?

Thanks

Karthiekyan Karumalaisamy