How To Fix D0100 - Only one long field allowed per table

SAP Error Message - Details

• Message type: E = Error

• Message class: D0 - Machine-level ABAP/4 Dictionary texts (e.g. debugging)

• Message number: 100

• Message text: Only one long field allowed per table

What causes this issue?

A table may contain only one field of data type LCHR or LRAW.

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?

Remove the superfluous fields of type LCHR or LRAW from the table or
change the data types of these fields. Make sure that the
remaining field of type LCHR or LRAW is at the end of the table.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message D0100 - Only one long field allowed per table ?

  The SAP error message D0100, which states "Only one long field allowed per table," typically occurs when you are trying to define a database table in the Data Dictionary (SE11) that includes more than one long field (e.g., a field of type STRING or TEXT). In SAP, a long field is a field that can hold a large amount of data, and the database structure allows only one such field per table to maintain performance and data integrity.
  Cause:
  
  Multiple Long Fields: The primary cause of this error is the attempt to create or modify a table to include more than one field of type STRING, TEXT, or any other long data type.
  Table Definition: When defining a table, if you inadvertently add multiple fields that are classified as long fields, the system will trigger this error.
  
  Solution:
  To resolve the D0100 error, you can take the following steps:
  
  Review Table Structure: Go to the Data Dictionary (SE11) and review the structure of the table you are trying to create or modify.
  Limit Long Fields: Ensure that there is only one long field in the table. If you have multiple fields that are long, consider the following options:
  
  Combine Fields: If possible, combine the data from multiple long fields into a single long field.
  Change Data Types: Change the data type of one or more of the long fields to a shorter type (e.g., CHAR, VARCHAR, or NUMC) if the data can fit within the limits of those types.
  
  
  Adjust Table Design: If the design requires multiple long fields, consider splitting the data into multiple tables, where each table can have its own long field.
  
  Related Information:
  
  Data Types: In SAP, common long data types include STRING and TEXT. STRING is used for variable-length character strings, while TEXT is used for longer text entries.
  Performance Considerations: Having multiple long fields can lead to performance issues, which is why SAP restricts the number of long fields in a single table.
  Documentation: Refer to SAP documentation or the ABAP Dictionary documentation for more details on data types and table design best practices.
  
  By following these steps, you should be able to resolve the D0100 error and successfully define your table in SAP.