To provide additional value to article RE Accruals/Deferrals Configuration Guide, here’s the detailed proforma accounting entries for the rental accrual/deferral process for your reference. You may share it with other SAP Consultants/Users.
A. RENTAL EXPENSE
»»»» Deferral of Rental Expense

Dr Prepaid Rental                   xxxx
Cr Rental Expense                                      xxxx
Automatic set-up of prepaid rent

Dr. Rental Expense                      xxxx
Cr. Prepaid Rental                                              xxxx
Auomatic [...]

Real Estate component also uses the Accrual Engine application for accruals/deferrals of revenue and expenses. Here’s a simple guide on how to set-up & activate the accruals/deferrals in RE component.
1. Assign Company Code to RE Application Component
Path: IMG → Flexible Real Estatement Management (RE-FX) → Accounting →  Accrual/Deferral → Basic Settings → Assign Company Codes.
Transaction Code:  SPRO
2. Define Accounting Principle
Path: [...]

Error Message:
Processing not possible on 01/31/2010 - fiscal year 2010 not carried forward
Message No.: ACEPS061
Analysis and Diagnosis:
During periodic processing of accruals/deferrals (RERAALCN) in Flexible RE, the above error message occured. The key date entered is 01/01/2010. See screenshot:

Processing terminated, as date 01/31/2010 in company code 0001 falls in a future fiscal year.
Solution and procedures:
You must [...]

Requirement:
P&L account trading partner field should be automatically populated through the vendor/customer trading partner.
Solution/Requirements:
To populate automatically the trading partner field for P&L account line item, take note and follow these requirements and procedures:
1. Create one Company ID for each of your company code
Path: IMG → Enterprise Structure → Definition → Financial Accounting → Define company.
Transaction Code: OX15

2. Assign the [...]

Error Message:
Company code/accounting principle combination BP01/ not permitted
Message No.: ACE107
Analysis & Diagnosis:
During execution of transaction RERAALCN (Accrual/Deferral: Contracts) in Flexi RE, the above error message occured.
You want to carry out processing in the Accrual Engine for the combination

Company Code: BP01
Accounting Principle:.

In Accrual Engine Customizing, all permitted combinations of company codes and accounting principles must be [...]