How To Fix FDT_EXPRESSIONS852 - Mapping parameter position &1: Possible data loss, field length differs

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 852

• Message text: Mapping parameter position &1: Possible data loss, field length differs

What causes this issue?

For the current procedure call expression, the system has determined
that the procedure parameter and the associated BRFplus data object
(mapping position #&V1&) have different field lengths. At runtime, this
may lead to the following potentially critical situations:
The parameter is of type importing / changing / tables and the length of
the BRFplus object is greater than the length of the parameter.
The parameter is of type returning / exporting / changing / tables and
the length of the BRFplus object is smaller than the length of the
parameter.
In both cases, it may happen that a value passed to a data object or
parameter cannot be stored properly in the object or parameter. In such
a case, the value will be truncated so that it fits into the available
field length.

System Response

You can still activate the object, but unexpected system behavior might
occur at runtime.

How to fix this error?

Adjust the length either of the parameter or of the BRFplus data object.

Procedure for System Administrators

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS852 - Mapping parameter position &1: Possible data loss, field length differs ?

  The SAP error message FDT_EXPRESSIONS852 indicates that there is a potential data loss issue due to a mismatch in field lengths between the source and target mappings in a data transformation process. This typically occurs in the context of SAP Data Services or SAP Process Integration (PI) when mapping data fields from one structure to another.
  Cause:
  The error arises when:
  
  The length of the source field is greater than the length of the target field.
  The mapping is attempting to assign a value from a source field to a target field that cannot accommodate the full value due to its defined length.
  This can happen in various scenarios, such as when using expressions, transformations, or during data migration processes.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Field Lengths: 
  
  Review the definitions of both the source and target fields in the mapping. Ensure that the target field has a sufficient length to accommodate the data being mapped from the source.
  
  
  
  Adjust Target Field Length:
  
  If possible, increase the length of the target field in the data structure to match or exceed the length of the source field.
  
  
  
  Modify Mapping Logic:
  
  If increasing the target field length is not feasible, consider modifying the mapping logic. You can truncate the source data to fit the target field or use a transformation function to handle the data appropriately (e.g., using substring functions).
  
  
  
  Data Validation:
  
  Implement data validation checks to ensure that the data being processed does not exceed the expected lengths before mapping occurs.
  
  
  
  Testing:
  
  After making changes, thoroughly test the mapping to ensure that the error is resolved and that data integrity is maintained.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for Data Services or Process Integration for detailed information on data mapping and transformation best practices.
  SAP Community: Engage with the SAP Community forums to find discussions related to similar issues and solutions shared by other users.
  Error Handling: Implement error handling mechanisms in your data processing workflows to catch and log such errors for easier troubleshooting in the future.
  
  By following these steps, you should be able to resolve the FDT_EXPRESSIONS852 error and ensure that your data mappings are correctly configured without the risk of data loss.