How To Fix C0855 - - Internal error: Unknown data type allocated to parameter &

SAP Error Message - Details

• Message type: E = Error

• Message class: C0 - PP-PI: Messages for PI Sheet and Syntax Checker

• Message number: 855

• Message text: - Internal error: Unknown data type allocated to parameter &

What causes this issue?

The function module assigned to the function call you selected contains
parameter &V1&. Due to an internal error, the system was unable to
assign any of the data types used in the function call to the data type
of this parameter. For this reason, the parameter cannot be processed
correctly in the function call.

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?

INCLUDE NA_SYSVERW OBJECT DOKU ID TX LANGUAGE EN

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C0855 - - Internal error: Unknown data type allocated to parameter & ?

  The SAP error message C0855 - "Internal error: Unknown data type allocated to parameter &" typically indicates that there is an issue with the data type of a parameter being used in a function module, method, or report. This error can occur in various scenarios, such as when calling a function module or when processing data in ABAP programs.
  Cause:
  
  Incorrect Data Type: The parameter being passed to a function or method may have an unsupported or incorrect data type.
  Data Type Mismatch: There may be a mismatch between the expected data type and the actual data type of the parameter.
  Corrupted or Incomplete Data Dictionary: If the data dictionary is corrupted or not properly updated, it can lead to unexpected data types being recognized.
  Custom Code Issues: If there are custom developments or modifications in the system, they may not adhere to the expected data types.
  
  Solution:
  
  Check Parameter Definitions: Review the function module or method definition to ensure that the parameters are defined with the correct data types. Compare them with the calling program to ensure they match.
  Debugging: Use the ABAP debugger to trace the execution of the program and identify where the error occurs. Check the values and types of the parameters being passed.
  Data Dictionary Check: Ensure that the data dictionary is consistent and that all data types are correctly defined. You can use transaction SE11 to check the data elements and domains.
  Update or Rebuild: If the issue is related to a corrupted data dictionary, consider updating or rebuilding the affected objects. This may involve regenerating function modules or classes.
  Review Custom Code: If the error is occurring in custom code, review the logic to ensure that the correct data types are being used and that there are no type conversions that could lead to this error.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches or updates.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE37 (Function Module), SE80 (Object Navigator), and SE11 (Data Dictionary) to investigate the issue further.
  ABAP Documentation: Refer to the ABAP documentation for guidelines on data types and parameter handling.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance.