How To Fix W8152 - Expression & only allows single-line values

SAP Error Message - Details

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 152

• Message text: Expression & only allows single-line values

What causes this issue?

You have tried to create another line for element &V1&.
There are elements in a container which are single-line by definition
and which are multi-line by definition. Element &V1& has been defined
as single-line and therefore can only be assigned a single-line value.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message W8152 - Expression & only allows single-line values ?

  SAP Error Message:
  
  W8152 - Expression & only allows single-line values
  
  Cause:
  This warning message occurs when an expression or a condition in an SAP program or query expects a single-line value, but a multi-line or multi-value input is provided instead. Essentially, the system expects a scalar (single-line) value, but the input contains multiple lines or entries.
  Common scenarios include:
  
  Using a variable or field that contains multiple lines (e.g., internal table or multiline string) where only a single-line string is allowed.
  In selection screens or dynamic WHERE clauses, passing a range or multiple values where only a single value is expected.
  In ABAP code, when concatenating or comparing fields, or in expressions where only single-line fields are valid.
  
  
  Solution:
  
  Check the input data: Ensure that the variable or field used in the expression contains only a single line or single value.
  Adjust the data type: If the variable is an internal table or multiline string, convert or select only one line or value before using it in the expression.
  Modify the expression: Change the logic to handle multiple values properly, for example, by looping over the values or using appropriate operators that support multiple values.
  Use appropriate functions: If you need to handle multiple values, use functions or statements designed for that purpose (e.g., FOR ALL ENTRIES, IN operator with ranges).
  Check selection screen parameters: If the error occurs in selection screens, verify that the parameter or select-option is defined correctly (single value vs range).
  
  
  Related Information:
  
  This message is a warning (W), so it may not stop program execution but indicates a potential logical issue.
  Common in dynamic WHERE clause constructions or when using field symbols and data references.
  Review the ABAP code or query logic where the expression is constructed.
  SAP Notes and documentation related to dynamic WHERE clauses and data types may provide additional guidance.
  Example: If you have a variable lv_value defined as a string but it contains newline characters or multiple concatenated values, the expression using lv_value will trigger this warning.
  
  
  Example:
  DATA: lv_value TYPE string.
  
  lv_value = 'Value1
  Value2'. " Multi-line string
  
  IF lv_value = 'Value1'. " This will trigger W8152 because lv_value is multi-line
    " Do something
  ENDIF.
  Fix:
  DATA: lv_value TYPE string.
  
  lv_value = 'Value1'. " Single line
  
  IF lv_value = 'Value1'.
    " Do something
  ENDIF.
  Or, if multiple values are needed, handle them properly with internal tables or ranges.
  
  If you provide the specific code or context where the error occurs, I can help tailor the solution more precisely.