Form Personalization Locking Issue

In Oracle Sales Order form .

We have two Order Lines bearing Parent child relationship. (Logically) Not Model/Option Line

There are two form personalization

1) the form personalization putting a constraint on Child Lines QUantity line update so if some one tries to update Child line qty ,they see Error Type Msg box saying please update the quantity of Parent Line ,which if user does then that change automatically gets cascaded through a different ON Validate Trigger Form personalization.

2) Form personalization on Validate trigger using built in method calling Customer procedure to update sales order line through oe order pub.

Issue: