data Import Export Framework: PurchTable / PurchLine

My target is to Import some purchases data by odbc.

I create a  new processing group, with Purchtable

Select * FROM PurchTable
WHERE PurchTable.PurchStatus = 1

Then I created Sequenz 2 purchline

SELECT * FROM PurchLine

How can I filter Purchline only with PurchTable-criteria (Like PurchTable.PurchStatus = 1) ?