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Can SAP calculate interest during Dunning?
Yes. SAP can automatically calculate interest on overdue customer invoices during the dunning process based on system configuration.
How Interest is Calculated in SAP Dunning
Customer invoice becomes overdue
SAP checks the due date and grace period
System calculates interest using the configured interest rate
Interest amount is added to the dunning notice
Customer receives the dunning letter with interest details
Key Features
Interest can be calculated on open items
Supports customer-wise or group-wise interest rates
Interest can be applied at line-item level or dunning level
Supports simple and compound interest calculation based on configuration
Configuration Areas in SAP
Define Interest Indicator
Maintain Interest Key
Configure Interest Rates
Assign settings to the Dunning Procedure
Important SAP Transaction Codes
F150 – Dunning Run
FBMP – Dunning Configuration
XD02 – Change Customer Master
FBL5N – Customer Line Item Display
Example
Invoice Amount: ₹10,000
Overdue Days: 20
Interest Rate: 12% p.a.
Interest Calculation:
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Result: Interest amount of ₹65.75 is added to the dunning notice.
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MY ERP HUB || SAP FICO Training & Placements

What is a Dunning Block in SAP?
A Dunning Block is a setting used to prevent a customer or specific invoice from being included in the dunning process. When a dunning block is active, SAP will not generate dunning notices for that customer or document.
It is mainly used in special situations such as payment disputes, legal issues, or temporary payment agreements.
Purpose of Dunning Block
Prevent unnecessary dunning notices
Handle disputed invoices
Allow time for payment discussions
Exclude customers from dunning temporarily
Improve customer relationship management
Types of Dunning Block
1. Complete Dunning Block
Blocks all invoices of the customer from dunning.
2. Company Code Level Block
Blocks dunning for a specific company code.
3. Document Level Block
Blocks only selected invoices or documents from dunning.
Example
Scenario
Dunning Block Result
Customer disputes an invoice
No dunning notice generated
Customer requests payment extension
Dunning temporarily stopped
Invoice under legal review
Invoice excluded from dunning
Key Points
Dunning Block can be set at:
Customer Level
Company Code Level
Document Level
It does not clear or cancel invoices
It only stops dunning notices temporarily
Once the block is removed, invoices can again be included in dunning
SAP Configuration Path
SPRO → Financial Accounting → Accounts Receivable and Accounts Payable → Dunning → Define Dunning Block
Important T-Code
F150 – Dunning Run
In Simple Words
A Dunning Block tells SAP:
“Do not send dunning notices for this customer or invoice until the block is removed.”
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What is the Purpose of Dunning Levels in SAP?
Dunning Levels are used to control the dunning process in stages based on the number of overdue days. They help businesses send payment reminders with increasing seriousness until the customer clears the outstanding amount.
Each level defines:
The type of reminder notice
Dunning charges and interest
Time interval between reminders
Tone and seriousness of communication
Purpose of Dunning Levels
Categorize overdue invoices by severity
Send reminders step-by-step
Apply charges and interest at higher levels
Encourage timely customer payments
Improve follow-up and cash collection process
Reduce outstanding receivables
Example of Dunning Levels
Dunning Level
Overdue Days
Purpose
Action
Level 1
1–30 Days
Friendly reminder
First notice sent politely
Level 2
31–60 Days
Strong reminder
Warning notice issued
Level 3
61+ Days
Final reminder
Serious notice before action
Key Points
Each dunning level has separate text and rules
SAP can apply charges and interest based on level
System automatically moves invoices to next level if payment is not received
Up to multiple dunning levels can be configured in SAP
SAP Configuration Path
SPRO → Financial Accounting → Accounts Receivable and Accounts Payable → Dunning → Define Dunning Procedure → Maintain Dunning Levels
Important T-Code
F150 – Dunning Run
In Simple Words
Dunning Levels help businesses send payment reminders gradually, increase the seriousness of notices, and ensure customers pay overdue invoices on time.
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What is Grace Period in Dunning?
Grace Period in Dunning is the additional number of days given to a customer after the invoice due date before the dunning process starts.
It provides customers extra time to make payment without receiving dunning notices or penalty reminders.
Example of Grace Period
Invoice Date: 01-May-2024
Payment Due Date: 10-May-2024
Grace Period: 5 Days
In this case, the dunning process will start only after 15-May-2024.
If the customer pays within the grace period, no dunning notice will be generated.
Benefits of Grace Period
Improves customer satisfaction
Avoids unnecessary dunning notices
Maintains good customer relationships
Reduces manual follow-up efforts
Encourages timely payment
Key Points
Grace Period is maintained in the Dunning Procedure configuration
It is defined in days
Dunning starts only after:
Due Date + Grace Period
Helps avoid dunning customers for short payment delays
SAP Configuration Path
SPRO → Financial Accounting → Accounts Receivable and Accounts Payable → Dunning → Define Dunning Procedure → Maintain Dunning Levels
Field Name: Grace Period (Days)
Important T-Code
F150 – Dunning Run
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Both Dunning and Payment Reminder are used to follow up on overdue payments, but they differ in purpose, process, and impact.
Point
Payment Reminder
Dunning
Purpose
Friendly reminder for pending payment
Formal process to collect overdue payment
When Used
Before or on due date
After invoice becomes overdue
Nature
Polite and preventive
Formal and corrective
Levels
Usually single reminder
Multiple dunning levels
Charges
No penalty charges
Can include dunning charges and interest
Configuration
Simple setup
Requires dunning procedure setup
Execution
Manual or automatic reminder
Executed using F150 Dunning Run
Customer Impact
Maintains customer relationship
Indicates seriousness of overdue payment
Example
“Friendly reminder for payment due.”
“Final notice for overdue invoice.”
In Simple Words:
Payment Reminder → Friendly notification before serious action
Dunning → Official collection process for overdue invoices
Important SAP T-Code:
F150 – Dunning Run
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What is Dunning in SAP?
Dunning in SAP is the process of sending payment reminders to customers for overdue invoices. It helps companies manage outstanding receivables, follow up on delayed payments, and improve cash collection.
SAP automatically identifies overdue invoices and generates dunning notices based on predefined dunning levels and rules.
Key Points:
Used in SAP FI-AR (Accounts Receivable)
Helps reduce pending customer payments
Automates reminder letters and emails
Supports dunning charges and interest calculation
Executed using T-Code F150
Dunning Process in SAP:
Customer invoice is created
Payment due date is crossed
SAP identifies overdue invoices
Dunning run is executed using F150
Dunning notice is generated
Customer receives reminder for payment
Important Concepts:
Dunning Procedure – Defines rules and levels
Dunning Levels – Reminder stages (Level 1, Level 2, etc.)
Dunning Charges – Penalty charges for late payment
Dunning Block – Prevents invoices from being dunned
Dunning Area – Separate dunning for different business units
Benefits of Dunning:
Improves cash flow
Reduces overdue receivables
Automates payment follow-up
Enhances customer communication
Saves manual effort
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What is LSMW in SAP?
LSMW (Legacy System Migration Workbench) is a tool in SAP used to migrate data from legacy systems or external files like Excel, CSV, and Text files into SAP. It helps organizations upload large volumes of master and transaction data quickly and accurately using batch input sessions.
Uses of LSMW in SAP
Upload master data
Migrate legacy data
Mass data upload
Reduce manual entry
Data correction activities
Used during SAP implementation and support projects
Common Data Uploaded Using LSMW
Customer Master
Vendor Master
Material Master
GL Accounts
Asset Data
Advantages of LSMW
Saves time and effort
Reduces manual errors
Easy and efficient data migration
Supports Excel, CSV, and Text files
Very useful during SAP implementation
LSMW Process Steps
Create Project, Subproject & Object
Maintain Source Structures
Maintain Source Fields
Map Fields (Field Mapping)
Convert Data
Import Data
Execute Batch Input Session
Transaction Code
LSMW
Example
A company can upload 10,000 vendor records from Excel into SAP automatically using LSMW instead of entering data manually one by one.
Supported File Formats
XLS / XLSX
CSV
TXT
DAT
Key Points
LSMW uses the Batch Input method to post data into SAP.
Data is read from external files and processed in the background.
Proper field mapping and data conversion ensure successful uploads.

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SAP Lock Box Transaction Codes
SAP Lock Box is used in Accounts Receivable (AR) to automate customer payment processing through banks. It helps companies reduce manual effort and automatically clear open invoices.
Important T-Codes for Lock Box in SAP
FLB1 – Post-process Lockbox Data
FLB2 – Lockbox Batch Summary
FLB3 – Display Transmission Log
FLB4 – Display Lockbox Data
FLB5 – Maintain Lockbox Variants
FEBAN – Bank Statement Post Processing
FEBA – Bank Statement Overview
F-28 – Post Incoming Payments
FBL5N – Customer Line Item Display
FD10N – Customer Balance Display
How Lock Box Works
Customer sends payment to the bank.
Bank creates a Lock Box file.
SAP uploads the payment file.
SAP matches payments with invoices.
Open invoices are cleared automatically.
Benefits of Lock Box
✔ Reduces manual payment processing
✔ Speeds up invoice clearing
✔ Improves cash flow management
✔ Minimizes posting errors
✔ Saves time for finance teams
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SAP MM Movement Types in P2P Cycle 🚀
Understanding movement types is very important in SAP MM (Materials Management) because they control how stock is moved and updated in the system during the Procure-to-Pay (P2P) process.
✅ 101 – Goods Receipt for Purchase Order
Used when materials are received from the vendor.
✅ 102 – Reversal of 101
Cancels the goods receipt if there is an error.
✅ 103 – GR into Blocked Stock
Material is received but kept in blocked stock for inspection.
✅ 105 – Release from Blocked Stock
Moves blocked stock into unrestricted stock.
✅ 121 / 122 – Return to Vendor
Used to return defective or unwanted materials.
✅ 161 / 162 – PO Return & Reversal
Handles purchase order returns and reversals.
✅ 201 – Goods Issue to Cost Center
Material consumption for internal departmental use.
✅ 261 / 262 – Production Order Issue & Reversal
Used in production processes.
✅ 301 / 311 – Transfer Postings
Transfer stock between plants or storage locations.
✅ 551 / 552 – Scrapping & Reversal
Used for damaged or unusable materials.
📘 Most commonly used movement types in SAP MM: 101, 102, 122, and 161.
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