How To Fix AD844 - Conversion/ADD FIELDS for table with long raw field not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 844

• Message text: Conversion/ADD FIELDS for table with long raw field not allowed

What causes this issue?

Conversion by means of adding fields is not possible for tables with a
LONGRAW field. The reason for this is that such fields must always be
at the end of the table. Adding fields would violate this condition.

System Response

Action could not be carried out.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD844 - Conversion/ADD FIELDS for table with long raw field not allowed ?

  The SAP error message AD844 indicates that there is an issue with the conversion or addition of fields in a table that contains a long raw field. This typically occurs during database operations, such as when trying to modify a table structure that includes a long raw data type, which is not supported in certain contexts.
  Cause:
  
  Long Raw Field: The presence of a long raw field (e.g., BLOB or CLOB data types) in the table can restrict certain operations, such as adding or converting fields.
  Database Limitations: Some databases have limitations on how long raw fields can be handled, especially in terms of schema changes.
  Data Dictionary Changes: Attempting to make changes to the data dictionary (like adding fields) that involve long raw fields can trigger this error.
  
  Solution:
  
  Avoid Long Raw Fields: If possible, consider redesigning the table to avoid using long raw fields. Use alternative data types that are more manageable within the context of schema changes.
  Separate Tables: If you need to store large binary data, consider creating a separate table for the long raw data and linking it to the main table through a foreign key.
  Use Data Migration: If you need to change the structure of the table, you might need to migrate the data to a new table without the long raw field, make the necessary changes, and then migrate the data back.
  Check Database Documentation: Review the documentation for your specific database system to understand its limitations and best practices regarding long raw fields.
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or patches that may address this issue. There may be specific recommendations or fixes provided by SAP.
  
  Related Information:
  
  SAP Notes: Look for SAP Notes related to AD844 or long raw fields in the SAP Support Portal.
  Database Documentation: Refer to the documentation for the specific database you are using (e.g., Oracle, SQL Server) for information on handling long raw fields.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with an SAP Basis or database administrator for further assistance.