How To Fix DB860 - Invalid type: Table header or deeper type

DB860 - Overview

• Message type: E = Error

• Message class: DB - Messages for logical databases and background processing

• Message number: 860

• Message text: Invalid type: Table header or deeper type

What causes this issue?

When converting from an external format to an internal format, the
internal format was unpermitted. It is either an internal table or a
deeper structure (a structure containing one or more internal tables).
The system cannot convert from character format in this case.

System Response

Conversion unsuccessful.

Error message extract from SAP system. Copyright SAP SE.

DB860 - Details

• The SAP error message DB860 "Invalid type: Table header or deeper type" typically occurs when there is an issue with the data type definitions in the ABAP Dictionary or when there is an inconsistency in the data structure being used in a database operation. This error can arise in various scenarios, such as when working with internal tables, database tables, or when performing operations that involve data types.
  Causes:
  
  Incorrect Data Type Definition: The data type of a field or structure may not be defined correctly in the ABAP Dictionary.
  Inconsistent Data Structures: There may be inconsistencies between the data structure defined in the ABAP program and the actual database table structure.
  Use of Unsupported Data Types: Certain data types may not be supported for specific operations, such as using a nested table or a complex structure where a simple type is expected.
  Changes in Data Dictionary: If there have been recent changes to the