Preview pane creation

"Query object has multiple top level data sources " this error is coming while creating a preview pane.this error is showed while opening the form,how to resolve it?

So… does the query have multiple top level data sources?

Ive solved the issue,i have one doubt to clarify,i created a part in a listpage ,it showing the records correctly,but once i changed the form part property “part location” as preview pane,it showing repeating records,not showing properly,y it happens?