What is the use of chain and Endchain in ABAP?

What is the use of chain and Endchain in ABAP?

The statements CHAIN and ENDCHAIN in the dynpro flow logic define processing chains. The statements FIELD and MODULE can be executed between CHAIN and ENDCHAIN. The statements between CHAIN and ENDCHAIN form a processing chain. Processing chains cannot be nested.

What is on chain request in SAP ABAP?

ON CHAIN-INPUT similar to ON INPUT. The ABAP/4 module is called if any one of the fields in the chain contains a value other than its initial value(blank or nulls). ON CHAIN-REQUEST. This condition functions just like ON REQUEST, but the ABAP/4 module is called if any one of the fields in the chain changes value.

How do you make a screen in module pool?

Module Pool Program

1. Step-1. Go to SE80.
2. Step -3. Un check the check box and Click Yes button.
3. Step-4. Select Module Pool From the Type and Click on Save button.
4. Step-7. Create A screen – right click on Program Name ->Create->Screen.
5. Step-8. Give Screen number – 9000 & click on Yes Button.
6. Step-9.
7. Step-10.
8. Step-11.

How do you field validate a module pool?

Chain-EndChain In Module Pool

1. Go to SE38 , Provide Program name and click on Create Button.
2. Provide the title description and choose Type M Program and click on Save Button.
3. Declare some variables and tables statement in the program .
4. Provide the Screen Number ‘0001’ and then click on the Tick button.

What is a chain statement?

The CHAIN Statement. The CHAIN statement transfers control from one object program to another in the run unit with no subsequent return of control. The effect is as though the chained program is the main program in the new run unit.

What is search help in SAP ABAP?

Definition. Search helps are objects that you can use to assign input help (F4 Help) to screen fields. You can do this by creating a search help in the ABAP Dictionary and attaching it to the corresponding screen field. Use. The input help (F4 help) is a standard function of the SAP system.

What is chain Endchain module pool?

chain-endchain. When this command is used, all of the fields on the screen that belong to the processing chain (all of the fields listed in the field statements) are made ready for input again. Other fields are not ready for input.

Under which circumstances is module with addition on chain input executed?

Under which circumstances is module with the addition ON CHAIN-INPUT executed? (Single selection) When exactly one field within the CHAIN has a value other than its initial value.

What are modularization techniques in ABAP?

All ABAP programs are modular in structure and made up of processing blocks (see Structure of Processing Logic ). There are two kinds of processing blocks, those that are called from outside a program by the ABAP runtime system, and those that can be called by ABAP statements in ABAP programs.

How do you make a mandatory field in a module pool?

Making field mandatory/obligatory in Module pool programming

1. Go to transaction SE80 and create sample program.
2. Create screen with the desired fields.
3. Let’s say, we want to make Employee name as mandatory filed.
4. Now change the input field from the program tab to the required.

What is chain operator in ABAP?

Chain operatot can be used to combine lines of code that begin with the same word or sequence of words. eg- tables: mara, marc. write: / sy-subrc , sy-tabix.

What is F4 help in SAP ABAP?

However, when these power users cannot remember the codes or when less frequent users enter information into a transaction, SAP provides the so called F4 Help. F4 Help is an easily accessible popup dialog where users can find the right codes based on their descriptions.

What is chain-endchain in SAP?

What is CHAIN-ENDCHAIN in SAP. CHAIN and ENDCHAIN define processing chain in SAP ABAP Dynpro Flow logic. User can execute FIELD and MODULE between CHAIN and ENDCHAIN. Also, the statements between CHAIN and ENDCHAIN form a processing chain which cannot be nested.

Which statements can be executed between chain and endchain?

Between CHAIN and ENDCHAIN, the statements FIELD and MODULE can be executed. The statements between CHAIN and ENDCHAIN form a processing chain. Processing chains cannot be nested. The CHAIN statement can be specified in the event blocks at PAI and PBO , however, in the event block at PBO it has no effect.

How to over rule chain and endchain statement in se38?

To over rule this issue, Chain And EndChain Statement comes into the Flow Logic of the screen where the input fields are validated. Step 1. Open SE38 , give Program name and click on Create.

What is a processing chain?

A processing chain allows the joint processing of all the screen fields stated between CHAIN and ENDCHAIN after FIELD statements: The contents of all screen fields combined to a processing chain by the FIELD statements can be checked in the shared conditions ON CHAIN-INPUT and ON CHAIN-REQUEST of the MODULE statement.