Hi,
Reference : Oracle OAF tutorial" Exercise: Extending OA Framework Applications","Task 4: Extend the BC4J Validation Logic"Summary: extending PurchaseOrderLineEO and use setUnitPrice to throw error if unit price > 5000;Getting error when I try to add a new line - (oracle.jbo.InvalidOwnerException) JBO-25030: Failed to find or invalidate owning entity: detail entity , row key null.
Page used : OA Framework Toolbox Tutorial -> Transaction -> Create (Multi Step) -> Create Purchase Order (Basic Train) -> page train "Add Line Items" -> "Add Another Item" getting error after clinking this button.

Please help me to find out why the error is coming and share some more scenario when we can have this error and what things to keep in mind to avoid this error while writing master detail logic.ThanksSreejit Nair