How To Fix WL131 - Multiline element & cannot be assigned to a single-line element

SAP Error Message - Details

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 131

• Message text: Multiline element & cannot be assigned to a single-line element

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WL131 - Multiline element & cannot be assigned to a single-line element ?

  The SAP error message WL131, which states "Multiline element & cannot be assigned to a single-line element," typically occurs in the context of ABAP programming or when working with data structures in SAP. This error indicates that there is an attempt to assign a multiline (table or internal table) element to a single-line (scalar) variable, which is not allowed.
  Cause:
  
  Data Type Mismatch: The primary cause of this error is a mismatch between the data types. You are trying to assign a structure or an internal table (which can hold multiple entries) to a variable that is defined to hold only a single value.
  Incorrect Variable Declaration: The variable you are trying to assign the value to may not be declared correctly to handle the data type you are working with.
  Logic Error: There may be a logical error in your code where you are not correctly handling the data structure.
  
  Solution:
  
  
  Check Data Types: Ensure that the variable you are assigning to is of the correct type. If you are trying to assign a multiline element (like an internal table), you should either:
  
  Change the target variable to an appropriate type (e.g., an internal table or a structure).
  Use a specific entry from the internal table if you only need a single value (e.g., my_variable = my_table[ index ]).
  
  
  
  Use Appropriate Structures: If you need to work with both multiline and single-line elements, ensure that you are using the correct data structures. For example, if you have a table of records, you might need to loop through the table or access a specific index.
  
  
  Debugging: Use debugging tools to step through your code and identify where the assignment is happening. This can help you understand the flow of data and where the mismatch occurs.
  
  
  Review Code Logic: Ensure that your logic correctly reflects the intended data handling. If you are processing data from a database or an API, make sure you are correctly interpreting the data structure.
  
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with ABAP data types, especially the differences between scalar types (like CHAR, NUMC, etc.) and complex types (like TABLE, STRUCTURE).
  SAP Documentation: Refer to the official SAP documentation for more details on data types and structures in ABAP.
  Community Forums: Check SAP community forums or Stack Overflow for similar issues and solutions shared by other developers.
  
  By addressing the data type mismatch and ensuring that your variable declarations align with the data structures you are working with, you should be able to resolve the WL131 error.