Update data-flow-troubleshoot-guide.md

Updates related to User Story 1678093: https://mseng.visualstudio.com/TechnicalContent/_workitems/edit/1678093

Author: john-par

articles/data-factory/data-flow-troubleshoot-guide.md

@@ -23,8 +23,8 @@ This article explores common troubleshooting methods for data flows in Azure Dat
 ### Error code: DF-Executor-SystemImplicitCartesian
 
 - **Message**: Implicit cartesian product for INNER join is not supported, use CROSS JOIN instead. Columns used in join should create a unique key for rows.
-- **Causes**: Implicit cartesian product for INNER join between logical plans is not supported. If the columns used in the join creates the unique key
-- **Recommendation**: For non-equality based joins you have to opt for CROSS JOIN.
+- **Causes**: Implicit cartesian product for INNER join between logical plans is not supported. If the columns used in the join creates the unique key , at least one column from both sides of the relationship are required.
+- **Recommendation**: For non-equality based joins you have to opt for CUSTOM CROSS JOIN.
 
 ### Error code: DF-Executor-SystemInvalidJson