Message type: E = Error
Message class:  SPN - SPnego 
Message number: 001
Message text: Enter service provider name
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 SPN001 ("Enter service provider name") typically occurs when a user attempts to perform an action that requires specifying a service provider, but the required field for the service provider name is left blank. This error is common in various SAP modules, particularly in scenarios involving service management, procurement, or vendor management.
Cause:
Missing Input: The most straightforward cause is that the user has not entered a service provider name in the relevant field.
Incorrect Configuration: There may be issues with the configuration of the service provider settings in the system.
User Authorization: The user may not have the necessary authorizations to view or select service providers.
Data Integrity Issues: There may be issues with the master data related to service providers, such as missing or incomplete entries.
Solution:
Enter Service Provider Name: The immediate solution is to ensure that the service provider name is entered in the required field. Double-check for any typos Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
SPN000 New password and password confirmation do not match
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SPML006 Could not deactivate commit check for bgRFC unit &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SPN002 Enter password
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SPN003 Keytab succesfully imported
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.