How To Fix FDT_EXPRESSIONS549 - Table &1 has single column; only 'TABLE_LINE' can be specified as column

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 549

• Message text: Table &1 has single column; only 'TABLE_LINE' can be specified as column

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS549 - Table &1 has single column; only 'TABLE_LINE' can be specified as column ?

  The SAP error message FDT_EXPRESSIONS549 indicates that there is an issue with the way a table is being defined in a data structure or expression. Specifically, the error states that the table you are trying to use has only a single column, and therefore, only the 'TABLE_LINE' can be specified as a column.
  Cause:
  This error typically occurs in the context of using the SAP Fiori Design Time (FDT) or when working with data definitions in ABAP programs. The root cause is that the system expects a table structure with multiple columns, but the specified table only has one column. In such cases, the system does not allow you to specify any column other than 'TABLE_LINE', which is a special identifier used for single-column tables.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Table Definition: Verify the definition of the table you are working with. Ensure that it is defined correctly and that it has the expected structure. If it is indeed a single-column table, you may need to adjust your logic to accommodate this.
  
  
  Use 'TABLE_LINE': If your table is a single-column table, modify your code or expression to use 'TABLE_LINE' instead of trying to specify a different column.
  
  
  Modify Table Structure: If your business logic requires multiple columns, consider modifying the table structure to include additional columns. This may involve changing the underlying database table or the data structure in your ABAP program.
  
  
  Review Related Code: Look at the code or configuration where this error is being triggered. Ensure that you are not mistakenly trying to access a column that does not exist in the table.
  
  
  Consult Documentation: If you are unsure about the correct usage of tables and columns in your specific context, refer to the SAP documentation or help resources related to FDT or ABAP programming.
  
  
  Related Information:
  
  SAP Fiori Design Time (FDT): This is a framework used for designing and developing Fiori applications. Understanding how FDT handles data structures can help in resolving such errors.
  ABAP Data Dictionary: Familiarize yourself with the ABAP Data Dictionary, which provides tools for defining and managing data structures, including tables and their fields.
  SAP Community: If you continue to face issues, consider reaching out to the SAP Community forums where you can find discussions and solutions related to similar errors.
  
  By following these steps, you should be able to resolve the error and ensure that your table definitions and usages are correct.