What is the use of chain Endchain in module pool?
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What is the use of chain Endchain in module pool?
This error message disables the input screen and now the user can not provide correct values in the input field as it is disabled by the error message. To overcome this problem Chain And EndChain Statement is used in the Flow Logic of the screen where Input fields are validated.
Why do we use chain Endchain in SAP ABAP?
If the screen field contains flow logic validations than the remaining fields will also get disabled because in a group of fields validation one field data is dependent on another. Therefore to overcome this issue use CHAIN end ENDCHAIN.
What is field and chain in ABAP?
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. The statement CHAIN can be specified in the event blocks at PAI and PBO, is ignored, however, in the event block at PBO.
What is a 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.
How do you enable and disable fields in module pool?
In module pool screen select the input box and go to characterstics. Then select output only. Then it will become disable mode.
What are the events in module pool programming?
Events In Module Pool Programming
- PBO – Process Before Output: Whenever the program is executed using a tcode, the initial and default values are fetched and displayed on the screen.
- PAI – Process After Input: When a user passes any data/input on the screen, this event is triggered so that follow-up action can be taken.
What is chain operator in ABAP?
ABAP programming allows to concatenate consecutive statements with same keyword in the first part into a chain statement. If any two or more statements started with same keywords coded consecutively together or one after the other, ABAP has a feasibility to combine them in a single statement.
What is the use of chain in Python?
chain() function It is a function that takes a series of iterables and returns one iterable. It groups all the iterables together and produces a single iterable as output.
How do you hide the subscreen area in module pool?
if screen-group1 = ‘G1’. This code needs to be written under the PBO of the subscreen SUB1 and after selecting the radio button 2 press ‘Enter’ on keyboard to trigger the PAI from where this subscreen is being called.
How do you make a field non editable in SAP ABAP module pool?
If the begin_date < sy-datum –> then the field ‘ name’ should not be editable….screen-active = ‘1’.
- screen-input = ‘0’.
- screen-output = ‘1’.
- screen-invisible = ‘0’.
- screen-request = ‘1’.
- MODIFY SCREEN.
How many events are in a module pool?
There are four events available in module pool programming. PBO (Process Before Output):Triggered before MPP screen is displayed. PAI (Process After Input): Triggered after MPP screen is displayed whenever user raises an action. Also,Now PBO is also triggered.
Which event triggers first in module pool?
Assigned Tags. This event is triggered before the screen is displayed. The processing of screen before the display of screen is done in this event.
What is chain statement?
The information contained on the chain level includes the name and type of each chain in the structure, and the covalent links that connect it to other chains. All of this information is defined with the CHAIN statement.
