Message type: E = Error
Message class:  HRPADRU_LEGAL_FORMS - Legal forms RU 
Message number: 031
Message text: Customizing error: active interface wasn't found in & for form & (comp &)
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 HRPADRU_LEGAL_FORMS031 typically occurs in the context of the HR module, specifically when dealing with legal forms in the Russian payroll system. This error indicates that there is a problem with the configuration of the legal forms, particularly that an active interface for a specific form could not be found.
Cause: Missing Configuration: The error usually arises when the necessary customizing settings for the legal forms are not properly configured in the system. This could be due to missing entries in the customizing tables or incorrect settings. Inactive Interface: The specific interface that is supposed to be linked to the legal form is not active or has not been defined in the system. Incorrect Form or Component: The form or component specified in the error message may not exist or may not be correctly defined in the system.
Solution: Check Customizing Settings: Go to the transaction code SPRO and navigate to the relevant customizing
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRPADRU_LEGAL_FORMS030 Output error: fp job close error
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRPADRU_LEGAL_FORMS029 Output error: error occured while generating PDF
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRPADRU_LEGAL_FORMS032 Customizing error: active layout wasn't found in & for form & (company &)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRPADRU_LEGAL_FORMS033 Cluster table error
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.