WHY SAP FI-CA !!!!!!

SAP Financial Accounting (FI) delivers the standard Accounts Receivable (FIAR) module to track accounts receivable transactions. This module is tightly integrated with the Sales and Distribution (SD) module to enter and process customer master data, shipping, billing, and receivables.

As requirements became more complex and the data volume increased substantially over the last couple of years, SAP developed a module in FI for tracking A/R data. This application component is known as Contract Accounts Receivable and Payable (FI-CA). SAP promotes FICA as a subledger application alternative for the FI-AR module and Accounts Payables module (FI-AP).

FI-CA was developed to deal with a large number of different customers and different types of receivables. FI-CA is mainly used in industry-specific SAP components,

which by nature have many customers and many different receivable types. Examples industries are the public

sector, utilities, insurance, and telecommunications.

Even if you do not fall into one of these industry groups, you can still use contract accounting. The industry solutions for FI-CA have been available since 1999. An industry-neutral version was introduced in 2002.

FI-CA is not only tightly integrated with the core SAP components like FI,Controlling (CO), Customer Relationship Management (CRM), and SD, it also has the capability to deal with customers and payments over the Internet by using SAP Biller Direct, which allows your company to use electronic bill presentment and payment (EBPP).

One of the weak points of FI-CA is its limited reporting functionality. SAP expects that customers who use the FI-CA module also have Business Information Warehouse (BW) installed. The FIAR module has better and more standard reports available and it will take considerable time and effort to develop these reports in FI-CA without using BW. SAP has recognized these shortcomings and promised improved reporting capabilities in future releases.

FI-CA incorporates more A/R functions than just processing invoices and payments and maintaining master data. These functions are necessary if you deal with a large customer base and a high volume of invoices and payments. 

This is the case with a utility, insurance, or telecommunications company or in the public sector. My description of FI-CA functionality can be a starting point for your decision process. If you determine that the described functions are necessary for your business, than FI-CA could be a valuable alternative to the standard FI-AR component

So from above explanation it is clear that sap fi-ca will be useful for following aspects :

1. Optimization for storage space is more in sap fi-ca than sap fico due to a special document structure which is followed in sap fi-ca. 
2. Parallel mass runs.
3. SAP business partner concept.
4. Documents are assigned to business partners and contract accounts 
5. Integrated to other Sap applications also like (CRM, FSCM, BI .....)