Sql Rank for records contain multiple combinations

I am trying to filter the records which contains multiple combinations and removing the records which contains a single combination. Database DB2

Query Used:

select * from 
(select b.Store,b.order, rownumber() over (partition by b.store order by b.order) AS RNK from Library.Table1 b) tmp where tmp.RNK > 1 order by tmp.Store

Current output:

Store Order RNK

Store1 Order1 1

Store2 Order1 1

Store2 order2 2

Store2 order3 3

Store3 Order1 1

Store3 order2 2

Store3 order3 3

Store4 Order1 1

Expected output:

Store Order RNK

Store2 Order1 1

Store2 order2 2

Store2 order3 3

Store3 Order1 1

Store3 order2 2

Store3 order3 3