Search table in Employee Portal

rikku

In Employee Portal, i need to configure search for Purchase Header table, so that its search result populates in Purchase Order webpart and also in Purchase Return Order webpart.
Configured for Purchase Order webpart , but inable to set for Purchase Return Order.
Both webparts are using the same table, so an error is showing while configuring
search (Employee Portal ->Users -> User -> Search Configuration),
'An EP Search Configuration already exists' . Please help.

Thanks in advance,
rikku