Sales order line status going back to Supply Eligible

Hi All,

I am trying to introduce an approval mechanism in sales order line (for ATO items) using Oracle Workflow. I have customized OM order Line (OEOL.wft) workflow for the same.

I have created one custom status ( like Pending Internal Approval) in which I am keeping that particular line into this status once this gets created. But the only problem is once my ATO line is in this custom status and when I make some changes like in quantity or other fields in that line it automatically converts that line status to Supply Eligible. I am not sure by which process or workflow this is happening.