To add extra row in JPA Container table

Vaadin 6 / 7 / 8 Framework Data Binding
1

I am displaying vaadin table using jpa container
txnDate txnID1 txnID2
------- RC/180 MS/8
but i want to add one more row in the place of txnID1, txnID2 should come.
how to achieve this.Jpa container contains only one row I need to add one more row based on the value of txnID2,
any valuable suggestion would be appreciated