How To Fix DO855 - Explicit key definition is not allowed (row type unstructured)

DO855 - Overview

• Message type: E = Error

• Message class: DO - Dictionary: Mass activation of domains and data elements

• Message number: 855

• Message text: Explicit key definition is not allowed (row type unstructured)

What causes this issue?

You can only explicitly assign a key to a table type if the row type of
the table type is a structure.

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?

Procedure for System Administrators

Choose a structured <DS:TX.DDDOC_ROWTYPE>row type</> or a more suitable
<DS:TX.DDDOC_KEYDEF>key definition</> for the specified row type.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DO855 - Explicit key definition is not allowed (row type unstructured) ?

  The SAP error message DO855, which states "Explicit key definition is not allowed (row type unstructured)," typically occurs in the context of data definitions in ABAP Dictionary or when working with internal tables in ABAP programs. This error indicates that you are trying to define a key for a row type that is considered unstructured, which is not permitted.
  
  Cause:
  
  Unstructured Row Type: The error arises when you attempt to define a key for a row type that does not have a structured format. In ABAP, a structured row type is one that has a defined structure with fields, while an unstructured row type does not have a fixed set of fields.
  Internal Table Definition: If you are defining an internal table and trying to specify a key for it, but the row type is declared as unstructured (e.g., using TYPE ANY or similar), this will trigger the error.
  
  
  Solution:
  To resolve the DO855 error,