Message type: E = Error
Message class:  RSODSO_GUI - UI related messages 
Message number: 017
Message text: No fields maintained. Enter a valid field name before saving the object.
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_GUI017 indicates that there are no fields maintained in the DataStore Object (DSO) you are trying to create or modify. This error typically occurs when you are working with the Data Warehousing Workbench in SAP BW (Business Warehouse) and you attempt to save a DSO without defining any fields.
Cause: The primary cause of this error is that the DSO definition is incomplete. Specifically, it means that you have not specified any fields (characteristics or key figures) for the DSO. A DSO must have at least one field defined to be valid and to save the object.
Solution: To resolve this error, you need to ensure that you have defined at least one field in the DSO. Here are the steps to do this: Open the DSO Definition: Go to the Data Warehousing Workbench and open the DSO that you are trying to create or modify. Define Fields: Navigate to the "Fields" tab
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
RSODSO_GUI016 Index ID &1 already exists. Choose another one.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
RSODSO_GUI015 Field name already exists at position &1. Choose a different name.
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_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...
Click on this link to search all SAP messages.