When you create a view, it is created on top of multiple database tables using inner joins. Please note that the underlying table of the database view should be a transparent table.
To create a view on 2 tables you have to enter the main table you want to maintain and place your cursor in the field and click the button below the table list and select another table to add the view . If you don't see this option, it means the relationship is wrong.
To learn more about database views: https://help.sap.com/doc/abapdocu_750_index_htm/7.50/en-US/abenddic_database_views. htm
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