How To Fix SEG016 - Top segment of a code page must be of sequence type

SAP Error Message - Details

• Message type: E = Error

• Message class: SEG - Code Page Segments

• Message number: 016

• Message text: Top segment of a code page must be of sequence type

What causes this issue?

Code Pages consist of segments.
Simple segments can contain a rule or a set of
character-codepoint-pairs (mappings). Larger segments are created by
combining several smaller segments into a new segment with type
'sequence'.
The content of a code page is defined by assigning it a segment.
To allow simple management, this segment must be of the type
'sequence'. (In all normal cases this condition is met automatically.)

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?

If you want to create a very simple code page that contains only one
rule or only one set of character-codepoint-pairs, you must also define
a 'sequence'-type segment, which only contains the segment you
previously selected.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SEG016 - Top segment of a code page must be of sequence type ?

  The SAP error message SEG016 ("Top segment of a code page must be of sequence type") typically occurs in the context of SAP's data dictionary or when working with segments in the context of IDocs or similar structures. This error indicates that the top segment of a code page is not defined correctly as a sequence type, which is required for proper processing.
  Cause:
  
  Incorrect Segment Definition: The top segment of a code page is expected to be of a sequence type, but it has been defined as a different type (e.g., a simple type or a non-sequence type).
  Data Structure Issues: There may be issues with the data structure definitions in the IDoc or other data models where the top segment is not properly configured.
  Configuration Errors: Misconfiguration in the IDoc type or message type can lead to this error.
  
  Solution:
  
  
  Check Segment Definition:
  
  Go to the transaction code WE30 (IDoc Type Development) or SE11 (Data Dictionary) to check the definition of the segments.
  Ensure that the top segment is defined as a sequence type. You can do this by checking the properties of the segment in the segment editor.
  
  
  
  Modify the Segment:
  
  If the top segment is not defined as a sequence type, modify it accordingly. Change its type to a sequence type if necessary.
  Save and activate the changes.
  
  
  
  Review Related Structures:
  
  Check any related structures or message types that may reference the top segment. Ensure that they are also correctly defined and consistent with the expected structure.
  
  
  
  Testing:
  
  After making the necessary changes, test the IDoc or data structure to ensure that the error is resolved and that the data is processed correctly.
  
  
  
  Consult Documentation:
  
  If you are unsure about the definitions or the required types, refer to SAP documentation or consult with a colleague who has experience with IDoc configurations.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  WE30: IDoc Type Development
  WE31: Segment Definition
  SE11: Data Dictionary
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Community Forums: Consider searching or posting in SAP community forums for additional insights from other users who may have encountered the same issue.
  
  By following these steps, you should be able to resolve the SEG016 error and ensure that your SAP system processes the relevant data correctly.