How To Fix UCT8259 - Cannot derive source selection for &1 from &2

SAP Error Message - Details

• Message type: E = Error

• Message class: UCT8 - Message class for UCT8(mapping)

• Message number: 259

• Message text: Cannot derive source selection for &1 from &2

What causes this issue?

The method has a mapping rule that splits the value of source field &V1&
and moves it into target field &V2&. The method attempts to derive the
source selection for source field &V1& from the target field &V2&, but
fails.

System Response

The system cannot determine the source selection for source field &V1&.
Thus, the system may read more source data than was originally intended,
which can affect performance. If the source field is a time
characteristic, the problem becomes critical.

How to fix this error?

Check whether the split operation has the correct offset and the length
in the mapping rule for target field &V2&. Also check whether the
<LS>Conversion Exit</> and <LS>Input Conversion</> indicators are set
properly.
If the <LS>Conversion Exit</> indicator is selected, the split uses the
external format of source field &V1&; otherwise, it uses the
SAP-internal format of the source field.
If the <LS>Input Conversion</> indicator is selected, the split uses the
external format of target field &V2& to derive the values of field &V1&
for the source selection; otherwise, it uses the SAP-internal format of
the target field.
&example&
You want to split the source field Fiscal Year/Period into the target
fields Fiscal Year and Posting Period. The internal format of the source
field is <AB>YYYYMMM</> (for example, <AB>2006012</>), and the external
format is <AB>MMM/YYYY</> (for example, <AB>012/2006</>). For target
field Fiscal Year you define a move from the source field with an offset
of 0 (zero) and a length of 4 (four), and you leave the Conversion Exit
and Input Conversion indicators unselected. For target field Posting
Period you define a move from the source field with an offset of 4
(four) and a length of 3 (three), and here you also leave the Conversion
Exit and Input Conversion indicators unselected.
Now you execute the method in fiscal year 2006 and posting period 12
(which internally has the format <AB>012</>). When deriving the source
selection for the source field Fiscal Year/Period, the values <AB>2006
</> and <AB>012</> are combined to <AB>2006012</> (which reflects the
internal format of the source field).

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 UCT8259 - Cannot derive source selection for &1 from &2 ?

  The SAP error message UCT8259, which states "Cannot derive source selection for &1 from &2," typically occurs in the context of data extraction or transformation processes, particularly when working with SAP BW (Business Warehouse) or SAP Data Services. This error indicates that the system is unable to determine the source selection for a specific object or data source.
  Cause:
  The error can be caused by several factors, including:
  
  Missing or Incorrect Source Definition: The source system or data source may not be properly defined or may be missing in the configuration.
  Inconsistent Data Model: There may be inconsistencies in the data model, such as missing fields or incorrect mappings.
  Authorization Issues: The user may not have the necessary authorizations to access the source data.
  Technical Issues: There could be technical issues with the data extraction process, such as connectivity problems or issues with the underlying database.
  
  Solution:
  To resolve the UCT8259 error, you can take the following steps:
  
  
  Check Source Definition:
  
  Verify that the source system or data source is correctly defined in the SAP BW or Data Services environment.
  Ensure that all necessary fields and mappings are correctly set up.
  
  
  
  Review Data Model:
  
  Check the data model for any inconsistencies or missing elements that could prevent the source selection from being derived.
  Ensure that all required fields are present and correctly mapped.
  
  
  
  Authorization Check:
  
  Ensure that the user executing the process has the necessary authorizations to access the source data.
  Review the authorization roles and profiles assigned to the user.
  
  
  
  Technical Troubleshooting:
  
  Check for any connectivity issues between the SAP system and the source database.
  Review logs for any additional error messages that may provide more context about the issue.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific version of SAP BW or Data Services you are using for any known issues or additional troubleshooting steps.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above steps, consider reaching out to SAP Support for further assistance. Provide them with detailed information about the error, including the context in which it occurs.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to error UCT8259, as they may provide additional insights or patches.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Documentation: Review the official SAP documentation for BW or Data Services for best practices in data extraction and transformation.
  
  By following these steps, you should be able to identify and resolve the underlying cause of the UCT8259 error in your SAP environment.