Use of Bol and Genil Programing

Hi All,
I am new to CRM, could you please explain what is the use of Bol & Genil programming?
Thanks,
Krishna

Hi Anil,
The BOL and GenIL essentially refer to the layers that handles the user interface in SAP CRM.
The GenIL (Generic Interaction Layer) consists of one implementation class that always derives from one of the two classes and implements a set of methods to provide the functionality. GenIL is like a bridge between the backend APIs and the UI i.e. for
a given UI, it identifies which APIs need to be called and also re-formats data accordingly.
The BOL (Business Object Layer) consists of upto 7 different kinds of objects that are defined in a model. At runtime, the BOL layer will hold data that is used on the UI. BOL provides a consistent way of modelling data so that data access is consistent and the UI can also be built faster.
This is just a brief information - you need to go through details documents to understand this in detail. SAP CRM comes with a sample genIL implementation that can be found in CRM_GENIL_SAMPLE package. You can check this package to see how GenIL and BOL layers can be implemented.
Regards,
Shiromani

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Hi Team
Am very new to CRM.So pls let me know the difference between the BOL and GENIL objects and their respective importance.
Thanks

Hi,
The BOL and GenIL essentially refer to the layers that handles the user interface in SAP CRM.
The GenIL (Generic Interaction Layer) consists of one implementation class that always derives from one of the two classes and implements a set of methods to provide the functionality. GenIL is like a bridge between the backend APIs and the UI i.e. for
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Regards,
Shiromani

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Hi All, I am confused in GenIL programming in CRM 7.0, pls help.
1 Why there are 2 methods related to object method execution u201CIF_GENIL_APPL_INTLAYEXECUTE_OBJECT_METHODu201D and u201CIF_GENIL_APPL_INTLAYEXECUTE_OBJECT_METHOD2u201D, as I debugged, the former one will be called whatever the return type is Object or DDIC and I don't know how "EXECUTE_OBJECT_METHOD2" could be called.
2 whatu2019s the usage of Object with Type u201CSearch Result Objectsu201D? I see it could combine data into result. But how to use it? Is there any sample for it?
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4 the best practice of using u201CIF_GENIL_APPL_INTLAYON_AFTER_COMMITu201D and u201CIF_GENIL_APPL_INTLAYON_AFTER_ROLLBACKu201D? whatu2019s the general purpose of those two methods? in it, what should I do and what should not do?
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Hi Richard,
I am going to try and tackle all four at once. The answers are not complete clarifications, but should give you a good start. I am not logged into a system to check everything right now.
1.
As far as I recall the two methods differ in ther signature. METHOD() will only allow you to pass flat values and recieve flat values whereas METHOD2() gives you the ability to at least recieve references to objects and data.
2.
Your assumption is right. Result objects are exactly for the purpose to combine data of different areas into one handy object in a result list. The are create on the fly. Meaning there is no implementation class. Just specify them in your BOL dynamic query as resu lt object and fill the structure accordingly. It is just a nice thing to have on the UI. Logic for data fetching is combined in one central place. Can be reused everywhere
3.
Same as 2.. From my experience you can include view objects in the model hierarchy. For instance when fetching data from a remote destination and just displaying it on the UI.
4.
Looks to me like methods for implementing your own GenIL component and/or Root Object. In these two cases you would want to get information about the BOL transaction context. Cleanup your stuff or initialize. Have a look at the BP component. It is rather cleanly implemented. BT tends to be a little bit cetralized around CRM_ORDER_MAINTAIN.
Hope it helps. I held trainings concerning those topics and it is a topic I could go on about for at least an hour. BOL and GenIL are badly documented and there are many pitfalls.
cheers Carsten

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Using a BOL Programming on an API level?

Hi Experts,
For the time being I was pretty sure that SAP CRM developers shouldn't combine layers when developing some enhancement.
However recently I had a problem to convince my colleagues and myself as well - why not?
I understand all the architecture and layers logic, but what is exactly wrong when someone uses BOL programming when creating own programs or when enhancing system via BADI. BOL programming in SAP CRM is much simplier, efficient and convenient. Using BOL programming to update some data instead of CRM_ORDER_MAINTAIN (I hate it ) is luring, so what the arguments are against using it, in example in a BAdI like ORDER_SAVE?
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Lukasz

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The best answer on why not to mix BOL and one order BADI's is "recursion". If you look underneath the covers all those BOL objects for one order are calling the one order API which then stuff like ORDER_SAVE sits inside of those API calls. Now if you want to write standalone code outside of the API layer(BADI's, BTE's) and use BOL instead of one order API function modules, there should be no problems.
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Good points and nice analogy.
I guess the interesting question is always if in a particular BADI using the BOL is OK or not. I was just looking around some of the BADIs implemented in one of our systems. The best hints regarding the APIs to use when implementing a particular BADI are always the default implementations and the BADI interface. For example, the interface of the BADI CRM_IUICMD_BADI uses the class CL_CRM_BOL_ENTITY in most of the methods. This is already a pretty good hint, that using the BOL would be OK here .
In contrast to that, the interface for the BADI ORDER_SAVE just uses GUIDs (CRMT_OBJECT_GUID). All existing implementations are implemented using function modules like CRM_ORDERADM_H_READ_OB or CRM_ORDER_MAINTAIN. Again, this should be hints enough to not use the BOL when implementing this BADI.
I'm really confused about BOL and webservices since there is a webservices tool for CRM that uses BOL objects, but I guess once again if you want to build custom webservices by hand without using the tool, that should work also.
Yes, I was thinking about implementing a custom Web service without the usage of the Web service tool. But now that you mention it; the Web service created by the Web services tool are based on the BOL. So this shows, that the BOL is definately suitbale to implement interfaces to external systems (as SOAP Web service, simple RFCs or what ever).
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