How To Fix MQ789 - Currency type for ledger &1 is not allowed to be changed from 80 -> 30

SAP Error Message - Details

• Message type: E = Error

• Message class: MQ - Messages for Euro Changeover Package

• Message number: 789

• Message text: Currency type for ledger &1 is not allowed to be changed from 80 -> 30

What causes this issue?

The currency type for ledger &V1& cannot be changed from 80 to 30 since
one of the following conditions has not been met:
Ledger &V1& with totals table &V4& is not assigned to totals table
ECMCT or FILCT.
Ledger &V1& does not use currency type 80.
Client currency &V2& and ledger currency &V3& are different.
Ledger &V1& has not been converted within a euro conversion.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MQ789 - Currency type for ledger &1 is not allowed to be changed from 80 -> 30 ?

  The SAP error message "MQ789 Currency type for ledger &1 is not allowed to be changed from 80 -> 30" typically occurs in the context of financial accounting and controlling when there is an attempt to change the currency type of a ledger in a way that is not permitted by the system.
  Cause:
  
  Currency Type Definition: In SAP, currency types are defined for ledgers. The currency type '80' usually represents the local currency, while '30' might represent a different currency type (like a group currency or a foreign currency). Changing the currency type from '80' to '30' is not allowed because it can lead to inconsistencies in financial reporting and data integrity.
  Configuration Restrictions: The system has built-in restrictions to prevent changes that could compromise the integrity of financial data. Changing the currency type of a ledger that has already been used for transactions is generally not allowed.
  
  Solution:
  
  Review Configuration: Check the configuration settings for the ledger in question. Ensure that the currency types are set correctly according to your business requirements.
  Consult Documentation: Refer to SAP documentation or help resources to understand the implications of changing currency types and the correct procedures for making such changes.
  Use Alternative Approaches: If you need to change the currency type for reporting or other purposes, consider creating a new ledger with the desired currency type instead of changing the existing one.
  Contact SAP Support: If you believe that the change is necessary and valid, consider reaching out to SAP support for guidance on how to proceed without violating system constraints.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like OB22 (for defining currency types) or OBA7 (for managing ledgers) to review and adjust your settings.
  Documentation: SAP Help Portal and SAP Notes can provide additional insights into currency types and ledger management.
  Testing: Always test changes in a development or sandbox environment before applying them to production to avoid disruptions.
  
  Best Practices:
  
  Data Integrity: Always prioritize data integrity and compliance with financial regulations when making changes to financial configurations.
  Change Management: Implement a change management process to document and review any changes to financial configurations to ensure they are necessary and properly executed. 
  
  By following these guidelines, you can address the error message effectively while maintaining the integrity of your financial data in SAP.