Thursday, February 3, 2011

Fallback class in a BADI

Fallback Class:

The Fallback option is used if no BAdI implementation with suitable filter conditions and no standard implementation are found.

1. Create a simple Enhancement spot:

1.1. Go to Transaction SE18 and Create an Enhancement spot.

1.2. A dialog appears.

1.3. Specify a name of Enhancement spot and a short description. Optionally, you

can assign the new spot to an already existing composite enhancement spot.

1.4. Save and activate the new simple Enhancement spot.

2. Create a BAdI definition:

2.1. Now create a BAdI within the Enhancement spot, click on create BAdI definition icon as shown below.

2.2. A dialog box appears.

2.3. Enter a name and a short text for the BAdI Definition.

2.3. The new BAdI appears as a node in the tree display of the tab page.

2.4. Deselect thee Multiple Use check box.

3. Create a Interface:

Methods are defined in the interface which determines what use you can make of your BAdI.

3.1. Expand the BAdI node and click on the Interface as shown below.

3.2. Enter a name for the BAdI Interface.

3.3. Press Enter or Click on change icon.

3.4. Define a method.

3.5. Now define parameters for the method as shown below.

3.6. Save and activate the BAdI Interface and Enhancement spot.

3.7. Go back to Enhancement spot screen.


We have created a single use BAdI, Now if we the run the Application Program it dumps because there should be one active implementation for a single use BAdI.

We can handle this in two ways:

§ Catch the exception CX_BADI_NOT_IMPLEMENTED.

§ Use a Fallback Class.

4. Create a Fallback Class:

The Fallback option is used if no BAdI implementation with suitable filter conditions and no standard implementation are found.

4.1. Enter a name for the Fallback Class and press enter.

4.2. Select the checkbox - Call fallback class if no implementation is executed

4.3. Enter a name for the Class.

4.2. Press Enter or click on change icon it will take us to class builder.

The method of the BAdI interface is already defined.

4.4. Save and activate the interface.

5. Implement Class:

5.1. To Implement Class double click on the method Z_IF_BADI_FALLBACK~ADD.

5.2. Write the below code in method.

result = value1 + value2.

5.6. Save and activate the Implementation.

6. Calling BAdI in the Application:

After the BAdI definition and implementation, BAdIs can be called using a combination of the ABAP statements GET BADI and CALL BADI.

Ø GET BADI – for getting objects

Ø CALL BADI – for calling interface methods

* Parameter Declaration..............................
p_value1 TYPE i,
p_value2 TYPE i.
* Data Declaration.......................................
w_handle TYPE REF TO zbadi_fallback_def,
w_result TYPE i.
* GET BADI - for getting objects..................
GET BADI w_handle.
* CALL BADI - for calling interface methods.
CALL BADI w_handle->add
value1 = p_value1 " 100
value2 = p_value2 " 200
RESULT = w_result. " 300
  WRITE: 'RESULT:', w_result.

7. Result:

Execute the Application.

Result : 300

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