Add a CaseTypeRef property to the Line Item data type. Case Types A and B possess a Query (tisf Uneltem) property. This List Query property sources a D_UneltemList data page that accepts a pylD parameter.

Add a CsseTypeRef property, an ObjClass property, and Query property related to the Line Item data type. The Query property sources a Lookup Data Page that accepts ObjClass and CaseTypeRef parameters.

Add CaseTypeARef and CaseTypeBRef properties to the Line Item data type. The CaseTypeARef property is a case reference to Case Type A. The CaseTypeBRef property is a case reference to Case Type B.

Case Types A and B both possess an embedded list of line items. Define a Declare Index against each embedded list. Change the direct inheritance class for each Declare Index class to the Line Item data type.