Hello Vijay,
These two tables are attribute and text. In a vewi you will get only the records which are common in both table that is it will be based on join condition. So if you create a view on attr and text table then you will only get the records which have texts maintained in you table and it will miss all records in attr table for which the text is not maintained.
If you want all records of both tables then you will have to create two separate datasources for both tables and then merge it in bw with a DSO.
This is the same reason why we have lot of different text and attribute master datasources in standard content in BW.
Thanks
Amit