Consolidate posting across contracts

Question

Hello
We have one master contract and under that we have numerous addendum contracts. We want that while running RERAPP, system should post one accounting document per master contract i.e. customer should be debited only once with reference to master contract number.
We tried to use standard BADi but it does not give us enough space/ opportunity/ flexibility to achieve this.
Since number of addendum contracts under main contracts are as huge as 1000 in number, client is not interested in posting 1000 accounting documents. Nor do our customer (tenant) would like to see these items in customer statement.
Though I did show to client RERAINV whereby we can club multiple documents into single invoice per BP but their requirement is to have one customer line item per master contract.
Please advise
Rakesh

Answer 1

Dear Rakesh Sharma.
I also have a experience such as client requirement. (By using Master Contract Number)
As you already know, Originally, RE Posting Document process by each contract number.
So, each posted debit line has a contract number filed or applied to assignment field
on the financial document.
In your ceases, One customer(Based on the master contract number) have multiple contract,
you can consider 2-options as below ;
1) You can define the Invoicing Process, Even if the financial document created by each contract
    number, you can summarize this line item on the rent invoicing by using t-code
     "RERAIV - Create Rent Invoices to Tenants".
    and, On the processing of Tax Invoice, you can communicate with Financial Module for
    summarizing the tax invoicing of each customer line(based on the debit line).
    - Individual or Aggregated Tax Invoicing Process
2) If you want to directly summarize the multiple line item of multiple contract number, you can      
   customize by using the Enhancements BADI such as below.
   (but this is not recommended method)
    - BADI_RERA_DOC_SPLIT : (You can define the criteria for "Posting Document Splitting".)
    - BADI_REEX_FI_BAPI : (Changes Document Data Before Call of FI BAPI)
Thank you.
Regards,
Jeong, Yeong Chul.