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Diff between RFC and BAPI?

Hi,

What Exactly the difference between RFC and BAPI?

When we use RFC nd when we go for BAPI?

Thanks,

Kumar.

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7 Answers

  • author's profile photo Former Member
    Former Member
    Posted on Apr 09, 2008 at 06:02 AM

    Hi,

    1)BAPI are RFC enabled function modules. the difference between RFc and BAPI

    are business objects. You create business objects and those are then

    registered in your BOR (Business Object Repository) which can be accessed

    outside the SAP system by using some other applications (Non-SAP) such as VB

    or JAVA. in this case u only specify the business object and its method from

    external system in BAPI there is no direct system call. while RFC are direct

    system call Some BAPIs provide basic functions and can be used for most SAP

    business object types. These BAPIs should be implemented the same for all

    business object types. Standardized BAPIs are easier to use and prevent

    users having to deal with a number of different BAPIs. Whenever possible, a

    standardized BAPI must be used in preference to an individual BAPI.

    The following standardized BAPIs are provided:

    Reading instances of SAP business objects

    GetList ( ) With the BAPI GetList you can select a range of object key

    values, for example, company codes and material numbers.

    The BAPI GetList() is a class method.

    GetDetail() With the BAPI GetDetail() the details of an instance of a

    business object type are retrieved and returned to the calling program. The

    instance is identified via its key. The BAPI GetDetail() is an instance

    method. BAPIs that can create, change or delete instances of a business

    object type

    The following BAPIs of the same object type have to be programmed so that

    they can be called several times within one transaction. For example, if,

    after sales order 1 has been created, a second sales order 2 is created in

    the same transaction, the second BAPI call must not affect the consistency

    of the sales order 2. After completing the transaction with a COMMIT WORK,

    both the orders are saved consistently in the database.

    Create( ) and CreateFromData! ( )

    The BAPIs Create() and CreateFromData() create an instance of an SAP

    business object type, for example, a purchase order. These BAPIs are class

    methods.

    Change( )

    The BAPI Change() changes an existing instance of an SAP business object

    type, for example, a purchase order. The BAPI Change () is an instance

    method.

    Delete( ) and Undelete( ) The BAPI Delete() deletes an instance of an SAP

    business object type from the database or sets a deletion flag.

    The BAPI Undelete() removes a deletion flag. These BAPIs are instance

    methods.

    Cancel ( ) Unlike the BAPI Delete(), the BAPI Cancel() cancels an instance

    of a business object type. The instance to be cancelled remains in the

    database and an additional instance is created and this is the one that is

    actually canceled. The Cancel() BAPI is an instance method.

    Add ( ) and Remove ( ) The BAPI Add adds a

    subobject to an existing object inst! ance and the BAPI and

    Remove removes a subobject from an object instance. These BAPIs

    are instance methods.

    2) No it is not possible to connect SAP to Non-SAP systems to retrieve data

    using RFC alone. RFC can acces the SAP from outside only through BAPI and

    same is for vice versa access.

    3) Each Bapi Object has Interface, Key Fields, Attributes,Methods and

    Events.

    Bapi Function Modules can be attached to these Bapi objects .Function module

    has a single bound functionality while a BAPI object can contain many

    functionalities

    rgds,

    bharat.

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  • author's profile photo Former Member
    Former Member
    Posted on Apr 09, 2008 at 06:05 AM

    Hi,

    When NON-SAP System want to directly interact with SAP system then you for BAPI

    With in sap you go for RFC enabled function module

    Some set of rules to be followed to create a BAPI.

    BAPI should not use CALL TRANSCATION

    BAPI should be registered in BOR

    ETC...................

    Regards,

    Siva Prasad Chalasani.

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  • author's profile photo Former Member
    Former Member
    Posted on Apr 09, 2008 at 06:07 AM

    Hi,

    Remote Function Call:

    RFC is an SAP interface protocol. Based on CPI-C, it considerably simplifies the programming of communication processes between systems.

    RFCs enable you to call and execute predefined functions in a remote system - or even in the same system.

    RFCs manage the communication process, parameter transfer and error handling.

    http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.

    BAPI

    BAPI stands for Business API(Application Program Interface).

    A BAPI is remotely enabled function module

    ie it can be invoked from remote programs like standalone JAVA programs, web interface etc..

    You can make your function module remotely enabled in attributes of Function module but

    A BAPI are standard SAP function modules provided by SAP for remote access.

    Also they are part of Businees Objest Repository(BOR).

    BAPI are RFC enabled function modules. the difference between RFc and BAPI are business objects.

    You create business objects and those are then registered in your BOR (Business Object Repository)

    which can be accessed outside the SAP system by using some other applications (Non-SAP) such as VB or JAVA.

    In this case u only specify the business object and its method from external system

    in BAPI there is no direct system call. while RFC are direct system call.

    Some BAPIs provide basic functions and can be used for most SAP business object types.

    These BAPIs should be implemented the same for all business object types.

    Standardized BAPIs are easier to use and prevent users having to deal with a number of different BAPIs.

    Whenever possible, a standardized BAPI must be used in preference to an individual BAPI.

    Check these Links out

    http://searchsap.techtarget.com/ateQuestionNResponse/0,289625,sid21_cid558752_tax293481,00.html

    http://www.sap-img.com/abap/interview-question-on-bapi-rfc-abap-objects-tables.htm

    http://www.sap-img.com/fu033.htm

    http://www.sap-img.com/abap/ale-bapi.htm

    Refer following SDN threads:

    diff-between-bapi-and-rfc

    bapi-and-rfc

    Regards,

    Priyanka.

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  • Posted on Apr 09, 2008 at 06:09 AM

    Hi,

    RFC is also a functional module but it is remote enabled that is from one system you can execute the RFC in another system. For this the radio button RFC in attributes column of the FM should be enabled.

    In RFC parameters are only pass by value and there is no pass by reference parameter in RFC.

    BAPI stands for Business Application Programming Interface. It is a library of functions that are released to the public as an interface into an existing SAP system from an external system.

    A BAPI function is a function module that can be called remotely using the RFC technology.

    Function modules are routines with a defined interface. They support optional parameters intended to perform specific tasks encouraging re-use.

    If u have a FM which is not RFC enabled, then u can copy this function module into your own ZFM and make it RFC enabled.

    Hope this is helpful.

    Reward points if useful.

    Thanks.

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  • author's profile photo Former Member
    Former Member
    Posted on Apr 09, 2008 at 06:14 AM

    Hi Kumar,

    BAPI stands for Business Application Programming Interface.

    It is a library of functions that are released to the public

    as an interface into an existing SAP system from an external

    system.

    RFC is the protocol used to call functions in an R/3 system

    by a caller external to R/3 or to call programs external to

    R/3 from an R/3 system.

    Functions can only be called via RFC, if they are tagged as

    RFC functions in the SAP development workbench. They are

    then called RFC function modules. BAPIs are complete sets of

    (BAPI) function modules that model a business application.

    When you are familiar with web developments: RFC can be

    compared to HTTP and BAPIs are CGI applications.

    In other words: A BAPI function is a function module that

    can be called remotely using the RFC technology.

    RFC Vs BAPI

    BAPI are RFC enabled function modules. the difference between RFc and BAPI are business objects. You create business objects and those are then registered in your BOR (Business Object Repository) which can be accessed outside the SAP system by using some other applications (Non-SAP) such as VB or JAVA.

    In this case you only specify the business object and its method from external system in BAPI there is no direct system call. while RFC are direct system call Some BAPIs provide basic functions and can be used for most SAP business object types. These BAPIs should be implemented the same for all business object types. Standardized BAPIs are easier to use and prevent users having to deal with a number of different BAPIs. Whenever possible, a standardized BAPI must be used in preference to an individual BAPI. It is not possible to connect SAP to Non-SAP systems to retrieve data using RFC alone. RFC can acces the SAP from outside only through BAPI and same is for vice versa access.

    RFC is the protocol used by SAP for remote communication, that is, for communications between remote (independent) systems. RFC is used for communications between two independent SAP systems, or for communications between an SAP system and a non-SAP system, such as an external application. It can also be used for communications between modules on the same system. Using the RFC interfaces you can extend the functionality of R/3 applications from an external program.

    Check this links for more information

    bapi--rfc

    http://www.geekinterview.com/question_details/40974

    Please reward if helpful,

    Thanks & Regards ,

    Sreekar.Kadiri

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  • Posted on Apr 09, 2008 at 06:18 AM

    Hi,

    1)Both RFC & BAPI are remote enabled functon mdule. RFC is used to access with in SAP system

    BAPI is used to acess non-sap system i.e. non sap tech like java, .net.

    2) Bapi is used to acess or upload data where as Rfc is not used to upload any data .

    Reward if its useful.

    Regards.

    Durgaprasad.

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  • author's profile photo Former Member
    Former Member
    Posted on Apr 09, 2008 at 06:24 AM

    Hi,

    1)BAPI are RFC enabled function modules. the difference between RFc and BAPI

    are business objects. You create business objects and those are then

    registered in your BOR (Business Object Repository) which can be accessed

    outside the SAP system by using some other applications (Non-SAP) such as VB

    or JAVA. in this case u only specify the business object and its method from

    external system in BAPI there is no direct system call. while RFC are direct

    system call Some BAPIs provide basic functions and can be used for most SAP

    business object types. These BAPIs should be implemented the same for all

    business object types. Standardized BAPIs are easier to use and prevent

    users having to deal with a number of different BAPIs. Whenever possible, a

    standardized BAPI must be used in preference to an individual BAPI.

    The following standardized BAPIs are provided:

    Reading instances of SAP business objects

    GetList ( ) With the BAPI GetList you can select a range of object key

    values, for example, company codes and material numbers.

    The BAPI GetList() is a class method.

    GetDetail() With the BAPI GetDetail() the details of an instance of a

    business object type are retrieved and returned to the calling program. The

    instance is identified via its key. The BAPI GetDetail() is an instance

    method. BAPIs that can create, change or delete instances of a business

    object type

    The following BAPIs of the same object type have to be programmed so that

    they can be called several times within one transaction. For example, if,

    after sales order 1 has been created, a second sales order 2 is created in

    the same transaction, the second BAPI call must not affect the consistency

    of the sales order 2. After completing the transaction with a COMMIT WORK,

    both the orders are saved consistently in the database.

    Create( ) and CreateFromData! ( )

    The BAPIs Create() and CreateFromData() create an instance of an SAP

    business object type, for example, a purchase order. These BAPIs are class

    methods.

    Change( )

    The BAPI Change() changes an existing instance of an SAP business object

    type, for example, a purchase order. The BAPI Change () is an instance

    method.

    Delete( ) and Undelete( ) The BAPI Delete() deletes an instance of an SAP

    business object type from the database or sets a deletion flag.

    The BAPI Undelete() removes a deletion flag. These BAPIs are instance

    methods.

    Cancel ( ) Unlike the BAPI Delete(), the BAPI Cancel() cancels an instance

    of a business object type. The instance to be cancelled remains in the

    database and an additional instance is created and this is the one that is

    actually canceled. The Cancel() BAPI is an instance method.

    Add ( ) and Remove ( ) The BAPI Add adds a

    subobject to an existing object inst! ance and the BAPI and

    Remove removes a subobject from an object instance. These BAPIs

    are instance methods.

    2) No it is not possible to connect SAP to Non-SAP systems to retrieve data

    using RFC alone. RFC can acces the SAP from outside only through BAPI and

    same is for vice versa access.

    3) Each Bapi Object has Interface, Key Fields, Attributes,Methods and

    Events.

    Bapi Function Modules can be attached to these Bapi objects .Function module

    has a single bound functionality while a BAPI object can contain many

    functionalities

    plz reward if useful

    rekha

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