Message type: E = Error
Message class:  RSODSO_GUI - UI related messages 
Message number: 020
Message text: Index field &1 of index &2 does not exist any more. Index adjusted.
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.
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.
The SAP error message RSODSO_GUI020 indicates that there is an issue with an index field in a DataStore Object (DSO) that no longer exists. This typically occurs when the structure of the DSO has been changed, such as when fields are deleted or renamed, and the index that was previously created is no longer valid.
Cause: Field Deletion or Renaming: The most common cause is that a field that was part of the index has been deleted or renamed in the DSO structure. Data Model Changes: Changes in the underlying data model or transformations that affect the DSO can lead to this error. Inconsistent Metadata: The metadata of the DSO may not be in sync with the actual data structure due to changes made in the DSO definition.
Solution: Check DSO Structure: Review the structure of the DSO to ensure that all fields referenced in the index still exist. If a field has been deleted or
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
RSODSO_GUI019 No indexes found. Switch to edit mode to create an index.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
RSODSO_GUI018 No semantical key field selected. Choose at least one field.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
RSODSO_GUI021 Row &1: Data type &2 is not supported. Choose a valid data type.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
RSODSO_GUI022 Row &1: Data type not specified
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.