Message type: E = Error
Message class:  FINS_FI_MIG - SAP S/4HANA Finance: Data Migration 
Message number: 348
Message text: Changed currency use from &2 to &3 for segment &1
For the universal journal entry, amounts are stored in a fixed order,
and not according to the currency positions in table T001A. If this
fixed order deviates from previous assignment of amounts to field
groups, the field group used for the receiver tracing factor with
receiver rule 'Variable Portions' is changed accordingly.
This only pertains to field groups KSL-0 and OSL-0 for segments
referring to certain company codes.
Technically, the value of field RCDATA in table T811S is changed for
records which have value '1' in field RRULE.
The record is migrated automatically.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FINS_FI_MIG348 typically occurs during the migration of financial data, particularly when there is a discrepancy in the currency settings for a specific segment in the financial documents. This error indicates that the currency used for a particular segment has changed from one currency to another, which can lead to inconsistencies in financial reporting and data integrity.
Cause: Currency Change: The primary cause of this error is that the currency for a specific segment (e.g., a line item in a financial document) has been changed from one currency (denoted as &2) to another (denoted as &3). This can happen due to: Manual adjustments in the financial data. Data migration processes where the currency settings were not correctly mapped. Changes in the configuration of the financial system that affect currency settings. Data Migration Issues: If you are migrating data from an older system to a new SAP system, there may be inconsistencies in how
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