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

SEG016 - Overview

• 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