Drag&Relate with BW Content in the SAP
Enterprise Portal 
Purpose
Using Drag&Relate, iViews can be
started from other iViews. The iViews
are related to another with Business Objects. In a Drag&Relate operation,
a Business Object is transferred from one iView (Drag&Relate Source) to
another iView (Drag&Relate Target) as a parameter. Transfer and starting
of the iView is done using by dragging the 
symbol with the mouse.
In SAP BW,
Business Objects correspond to InfoObjects of type Characteristic. With a Drag&Relate
operation, the characteristic, a characteristic value and the logical system
are transferred. When you only click on the symbol in a BEx Web Application without
dragging it to another iview, the master data with attributes from the
InfoObject Characteristic are
displayed.
Be careful that the Drag&Relate function does not replace the Goto by report-report interface function. Instead it should enhance these functions. For more information, see Differences Between Drag&Relate and Report-Report Interface
The Drag&Relate service uses the Relation Resolving Service and the Unification Controller Service to send requests to the connected systems using the Distributed Query Engine (DQE) via connectors. The Relation Resolving Service links Business Objects (see Linking Business Objects) that are stored in the Portal Content Directory (PCD) (see Creating Business Objects). Zur Laufzeit werden die Verknüpfungen von Business Objects als Abfragen zur Auflösung an die angeschlossenen Systeme geschickt. The requests are sent to the affected systems with the DQE. The communication between the DQE and the systems takes place via connectors that are maintained in the system landscape.
In the following, the necessary steps for using various Drag&Relate scenarios are described. For more information about the Drag&Relate function from Drag&Relate.
For more
information on the architecture of Drag&Relate and Unification and their
various services, see 
Unification.
This documentation refers to the function Drag&Relate for BW content in SAP EP 6.0 on Web AS 6.40 with SAP BW 3.5.
Prerequisites
In contrast to SAP EP 5.0,
Unification and Drag&Relate are integral components of the portal
infrastructure in SAP EP 6.0. A separate Unification Server is no longer
necessary. All specific applications for Unification and Drag&Relate are
specific iViews or parts of other applications such as the Portal Content
Studio. Ensure that you have made the basic settings under Settings for SAP BW
3.5 and SAP EP 6.0.
Not that
you maintain the properties Admin User ID (DQE)
and Admin Password (DQE) in the Creating a BW-System
in the Portal. Without these properties, the DQE cannot create a
connection to the BW system.
For more information on settings for
scenarios with ERP systems, see Unification with SAP
R/3 and BW and Setting Up SAP-R/3
Systems for Drag&Relate .
Process Flow
Maintenance of the connector for the Distributed Query Engine (DQE) in SAP EP is required for using Drag&Relate with BW content. Importing and linking Business Objects, along with maintenance of settings for the iView are activities that have to be performed for each Drag&Relate scenario.
To use Drag&Relate, take the following steps:
1. Create Business Objects. See Creating Business Objects.
2. Link the Business Objects. See Linking Business Objects.
3. Define iViews as Drag&Relate sources. See Defining an iView as a Drag&Relate Source.
4. Define iViews as Drag&Relate targets. See Defining an iView as a Drag&Relate Source.
5. Execute Drag&Relate. See Execute Drag&Relate.
Result
When the steps above are performed, the scenarios described under Executing Drag&Relate are enabled.