What do you mean by BAPI ? and tell about BAPI_REQUIREMENTS_CHANGE
hi ,
all experts in SAP please tell me what is BAPI ? and tell about BAPI_REQUIREMENTS_CHANGE?
thanks
Dear,
BAPIs provide a stable, standardized method for third-party applications and components to integrate into the Business Framework. These interfaces are being specified as part of SAP's initiative with customers, partners and leading standards organizations.
For MD61 you can use BAPI_REQUIREMENTS_CREATE and/or BAPI_REQUIREMENTS_CHANGE
we use it to create or change the planned independ requiremt useful for production plannning module.
Hope clear to you.
Regards,
R.Brahmankar
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Error Handling for Bundled Updates
Runtime errors can occur during execution of bundled updates. How are they handled? In general, COMMIT WORK processing occurs in the following order:
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praveenLUW is basically of two type:
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2. SAP LUW
LUW is logical unit of work means once the full transaction is complete (in case of SAP) or when we move from one screen to another (in case of DB LUW) then there should be a commit and rollback involved based on the success of transaction/screen.
Basically in case of DB LUW it could be the case that Transaction is incomplete and this will lead to DB inconsistency. For eg. If some bank transaction is there, if something is credited to one account then it should be debited from one account. On one screen u credited one account (DB LUW has been successful and DB has been changed) and on another screen u wanted to debit that account but on second screen it gave some error (DB LUW has not been successful and DB has not been changed) so it will lead to inconsistency.
TO remove this error SAP came up with SAP LUW which will do DB commit only once the transaction is through.
The R/3 system is multi user system and many users access the same information at the same time, which is mainly DATA. Consider the case where one user is modifying a record, and second user is trying to delete the same record. If the second user is successful in deleting the record then the first user will face problem for modifying the record that is already deleted. The avoid such situation, R/3 system has provided Logical Unit of Work, which is defined as a locking mechanism to protect transaction integrity. Of course, there are other measures, which ensures data integrity like check table i.e. foreign key relationship. Within SAP system there are three types of transaction and may be distinguished as:
Database transaction known as LUW. It can be defined as a period in which operation requested must be performed as a unit, i.e. all or nothing operation. At the end of LUW, either of the database changes are committed or rolled back.
Update transaction or SAP LUW. One SAP LUW can have several databases LUW. So a set of a database is either committed or rolled back. The special ABAP/4 command COMMIT WORK, marks the end of a SAP LUW.
ABAP/4 transaction. Is made up of a set of related task combined under one transaction code. ABAP/4 transactions are for programming environment, in which ABAP/4 transaction functions like one complete object containing screens, menus and transaction codes.
R/3 system has provided in built locking mechanism, which defines the Logical Unit of Work. Also user can set his own locking mechanism. The LUW starts when a lock entry in the system table is created, and it ends when the lock is released.
To provide the user the facility to communicate with the table in order to modify or delete or insert data, R/3 has provided tool called SCREEN PAINTER. This tool allows you to design screen, process screen through program and update the database table. SAP has provided one and only one way to update the database table, i.e. transaction. Though you can update database table by using open SQL statement through program, SAP usually doesnt recommend this kind of updating. Many standard transactions are available to update standard table but if the need arises, the developer should be able to develop new transaction, which allows the updating of database tables. This can be achieved by using various components of screen painter.
Transactions and Logical Units of Work
In everyday language, a transaction is a sequence of actions that logically belong together in a business sense and which either procure or process data. It covers a self-contained procedure, for example, generating a list of customers, creating a flight booking, or sending reminders to customers. From the point of view of the user, it forms a logical unit.
The completeness and correctness of data must be assured within this unit. In the middle of a transaction, the data will usually be inconsistent. For example, when you transfer an amount in financial accounting, this must first be deducted from one account before being credited to another. In between the two postings, the data is inconsistent, since the amount that you are posting does not exist in either account. It is essential for application programmers to know that their data is consistent at the end of the transaction. If an error occurs, it must be possible to
undo the changes made within a logical process.
In the R/3 System, there are three terms frequently used in this connection:
Database Logical Unit of Work (LUW)
A database LUW is the mechanism used by the database to ensure that its data is always consistent.
SAP LUW
An SAP LUW is a logical unit consisting of dialog steps, whose changes are written to the database in a single database LUW.
SAP Transaction
An SAP transaction is an application program that you start using a transaction code. It may contain one or more SAP LUWs.
The following sections of this documentation explain these three terms in more detail.
Database Logical Unit of Work (LUW)
Check the following link:
http://help.sap.com/saphelp_nw04/helpdata/en/41/7af4bca79e11d1950f0000e82de14a/frameset.htm
SAP LUW
http://help.sap.com/saphelp_nw04/helpdata/en/41/7af4bfa79e11d1950f0000e82de14a/content.htm
SAP Transactions
An SAP LUW is a logical unit consisting of dialog steps, whose changes are written to the database in a single database LUW. In an application program, you end an SAP LUW with either the COMMIT WORK or ROLLBACK WORK statement. An SAP transaction is an application program that you start using a transaction code. It may contain one or more SAP LUWs. Whenever the system reaches a COMMIT WORK or ROLLBACK WORK statement that is not at the end of the last dialog step of the SAP transaction, it opens a new SAP LUW.
If a particular application requires you to write a complex transaction, it can often be useful to arrange logical processes within the SAP transaction into a sequence of individual SAP LUWs. You can structure SAP transactions as follows:
With one or more SAP LUWs.
Transactions in this form consist entirely of processing blocks (dialog modules, event blocks, function module calls, and subroutines). You should be careful to ensure that external subroutines or function modules do not lead to COMMIT WORK or ROLLBACK WORK statements accidentally being executed.
By inserting an SAP LUW
The ABAP statements CALL TRANSACTION (start a new transaction), SUBMIT (start an executable program), and CALL FUNCTION... DESTINATION (call a function module using RFC) open a new SAP LUW. When you call a program, it always opens its own SAP LUW. However, it does not end the LUW of the SAP transaction that called it. This means that a COMMIT WORK or ROLLBACK WORK statement only applies to the SAP LUW of the called program. When the new LUW is complete, the system carries on processing the first SAP LUW.
By running two SAP LUWs in parallel
The CALL FUNCTION... STARTING NEW TASK statement calls a function module
asynchronously in a new session. Unlike normal function module calls, the calling
transaction carries on with its own processing as soon as the function module has
started, and does not wait for it to finish processing. The function call is synchronous. The called function module can now call its own screens and interact with the user.
An SAP LUW is a logical unit consisting of dialog steps, whose changes are written to the database in a single database LUW.
There are various bundling techniques that you can use to ensure that all of the database updates belonging to an SAP LUW are made in the same single database LUW.
Let one user is modifying a record and the second user is trying to delete the same record at the same time. If the second user is successful in deleting the record, then the first user will face problem in modifying the record. To avoid such problems, SAP has introduced LUW (Logical unit of Work)
LUW is defined as Locking Mechanism to protect transaction integrity.
Types of LUWs:
Database transaction or LUW.
Update transaction or SAPLUW.
ABAP/4 Transaction.
database transaction
Database transaction or LUW is defined as a period in which operation requested must be performed as one unit.
At the end of LUW, either the database changes are committed or rolled back.
SAP LUW
One SAP LUW can have several databases LUW. So a set of database transactions either committed or rolled back.
The special ABAP/4 command Commit work marks the end of SAP LUW.
ABAP/4 Transaction
It is made up of a set of related task combined under one transaction code.
ABAP/4 transaction functions like one complete object containing screens, menus and transaction code.
Also check this link.
http://help.sap.com/saphelp_nw04/helpdata/en/41/7af4bfa79e11d1950f0000e82de14a/content.htm
Check these links on LUW's
http://help.sap.com/saphelp_nw04/helpdata/en/41/7af4bfa79e11d1950f0000e82de14a/content.htm
http://help.sap.com/saphelp_47x200/helpdata/en/41/7af4c2a79e11d1950f0000e82de14a/frameset.htm
http://help.sap.com/saphelp_47x200/helpdata/en/41/7af4b9a79e11d1950f0000e82de14a/frameset.htm
Cheers,
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