I think there is a bug in the graphical SQL-design editor in the Dataset Query Dialog tab DIAGRAM with SQL Server database.
I added two tables and joined them via drag'n'drop of one key field that is available in both tables. So far so good (see attachment)
The SQL-Statement (tab Texts and Outline) is correct and works (... from tabA inner join tabB on tabA.key1 = tabB.key1)
Now I would like to add a second join requirement (... and tabA.key2 = tabB.key2) via graphical diagram-editor, but when I do this all tables in the diagram disappear and the outline-tab and text-tab have no FROM-part anymore (see attached screenshot red arrow).
This seems only to happen when I try to join two primary keys from each table, not when joining one primary key and a normal field.
Jaspersoft Studio 6.6.0 community ed. Win 64 bit.