How To Fix DA633 - Field modification from "NULLABLE" to "NOT NULL"

DA633 - Overview

• Message type: E = Error

• Message class: DA - Dictionary: Compare, distribution, timer, instantiation

• Message number: 633

• Message text: Field modification from "NULLABLE" to "NOT NULL"

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message DA633 - Field modification from "NULLABLE" to "NOT NULL" ?

  The SAP error message DA633, which states "Field modification from 'NULLABLE' to 'NOT NULL'," typically occurs during database operations, particularly when there is an attempt to change the definition of a database field in a way that violates existing constraints or data integrity rules.
  
  Cause:
  
  Schema Change: The error arises when there is an attempt to modify a database field from a nullable state (where the field can accept NULL values) to a non-nullable state (where the field must have a value).
  Existing Data: If there are existing records in the database where the field in question contains NULL values, changing the field to NOT NULL will violate the integrity of the data.
  Data Model Changes: This can happen during a transport of changes, an upgrade, or when modifying the data model in the ABAP Dictionary.
  
  
  Solution:
  
  
  Check Existing Data: Before making the change, check the existing data in the database table to see if there