Discussing about Business all in One (A1) and Business one (B1):

SAP All-in-One is based on the same stack than SAP ERP (JAVA, ABAP, SAP NW, etc.) (3-tier stack), whereas SAP Business One is m ore M SFT-oriented (COM API's, MS SQL, etc.) and a plain 2-tier stack.

Here I cut from fundamentals ppt file for simple different between them:

Advanced SMBs, on the other hand, need to be able to model and control their business processes using a software system. SAP has developed SAP Business One especially for such companies. As a guideline you can say that SAP Business One targets companies with up to 250 employees.

Since the business processes of sophisticated SMBs are more complex, these companies need a software system that is easy to implement, yet offers a broad range of business functionality. SAP has developed mySAP All-in-One especially for these companies.

 The difference always focuses on company's type and employee amounts. For example, it is retail or manufacturing, how about their business processes, do they maintain branches, etc...

We need to select SAP A1 or SAP B1 how it fits our client’s business requirement

On a number of occasions, people have asked me the difference between SAP Business One and SAP R/3. The non technical answer to this question is that; SAP Business One is SAP's offering for small and mid size companies, while R/3 is SAP's offering for large companies. This is especially true functionality-wise. More to it, the system architecture differs considerably and that hopefully supports the difference in functionality complexities (of SAP R/3 when compare with SAP Business One).

SAP Business One is software that was bought over by SAP and it has been greatly enhanced over time, however, not much has been done to its architecture. SAP R/3 is indigenous to SAP and it has also undergone various re-engineering over time, especially as it relates to its architecture. A fantastic testimony to this position is in the architecture of its successor, SAP ECC.

In subsequent posting, I hope to compare SAP R/3 and ECC in more detail, since the duo is more closely related. In this posting, I will x-ray the architecture (or the "anatomy" as I prefer to call it) of SAP Business One and SAP R/3, with a view to pointing out their architectural difference.

first, it is expedient to state that both SAP Business One and SAP R/3 are built on the concept of client/server architecture. So how do they differ? Let's first understand the relationship in a client server setup. A client server is a computer system design standard in which the client machines requests and gets back information from a distribution machine called the server.

SAP Business One as said earlier is based on client/server architecture, howbeit a "2 tier": strictly, clients and server. This technology is often referred to as a fat client. This is because all processing and business logic are carried out on the client. The result therefore is a system where logon and load balancing is a mirage. 

SAP R/3 is based on a three tier client/server technology. Typically, it is made up of three functionally distinct layers namely: the user interface, business logic and database.

The user interface, which is otherwise known as the presentation server displays the interface for users' communication with the SAP system. It is often referred to as the SAP GUI. As a matter of fact, it is a program called sapgui.exe. The application server is where the business logic and data manipulation takes place. Data processing, SAP administration tasks and client request/feedback management are handled within the business layer. The database layer is synonymous to the database server and it typically acts as a data repository for tables and other database objects and structures.

Ideally, an R/3 system is composed of one database server, one or more application servers and one or more presentation servers. SAP Business One on the other hand is composed of a database server and one or more presentation servers.

Business All in One (A1)

Business one (B1)

·      MySAP All-in-One brings the benefits of the mySAP Business Suite to small and midsize businesses (sophisticated SMBs) in a package especially tailored to their needs. ·    mySAP All-in-One solutions are designed by SAP partners as preconfigured and industry-specific systems based on a simplified system landscape with low maintenance costs. ·      It has been clear that A1 is used for medium size enterprise. ·     A1 is for medium and complex manufacturing i.e. process and discrete. ·         License price of A1 is higher. ·  In SAP A1 is more flexible and many availabilities ·         For an example it’s car ·         The stability higher than B1. ·         The functionality is more richer than B1 ·         The bugs free is more guarantee in A1 ·         The hardware and software requirement have many options and flexible than B1 ·         A1 is more helpful for medium enterprise and could probably helpful for a certain large enterprise. ·         AP A1 - 3 tier architecture. ·         SAP A1 processing is distributed between, application, presentation and database layers. ·         SAP A1 is pre configured

·         SAP Business One: SAP Business One contains all the functions required by small companies (advanced SMBs) and can be implemented in a matter of days. ·         It offers a broad range of innovative functions at minimum maintenance and operating costs. ·         All three products can be integrated with one another. ·         B1 is for small enterprise (or company). Meanwhile ·         One example, Manufacturing in B1 is for light manufacturing ·         License price is less than higher from A1 ·         In SAP B1 is Less than flexible from A1 ·         It’s a motor cycle. ·         The stability less high than A1. ·         The functionality is less richer than A1 ·         The bugs free less guarantee in B1 ·         The hardware and software requirement have not more flexible than A1 ·         B1 is not more helpful for medium enterprise. ·         SAP B1 is 2 tier architecture. ·         B1 is fat client processing mainly done at front end, ·         It’s not the case in SAP B1.