Filter ITMREF field in Orders

SOLVED

Hi,

I need to filter the products selection list when using itemref field in the POH2 screen.  The table and field [F:ITM]CCE(0)  contains the products linked to the order site. I want to show only products where [F:ITM]CCE(0) = [M:POH0]POHFCY

Could someone point me in the right direction?

Thanks