Message type: E = Error
Message class:  SEPMH_DG - EPM HANA DG - Messages 
Message number: 013
Message text: Invalid EPM node row (field NODE_KEY missing)
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 SEPMH_DG013, which indicates "Invalid EPM node row (field NODE_KEY missing)," typically arises in the context of SAP's Enterprise Performance Management (EPM) solutions, particularly when dealing with data models or hierarchies.
Cause: The error is generally caused by one of the following issues: Missing NODE_KEY: The NODE_KEY field is essential for identifying nodes in a hierarchy. If this field is missing from the data being processed, the system cannot correctly interpret the node structure. Data Integrity Issues: There may be inconsistencies or corruption in the data model or hierarchy, leading to missing or invalid entries. Configuration Errors: Incorrect configuration settings in the EPM model or data source can lead to this error. Data Load Issues: If data is being loaded from an external source and the NODE_KEY is not included in the data set, this error can occur.
Solution: To resolve the SEPMH_DG013 error, consider the following steps: Check Data Source: Ensure that the data source
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
SEPMH_DG012 Parent DB table buffer was not passed to child node '&1'
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SEPMH_DG011 Rule for creating DB rows for entity '&1' is missing
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SEPMH_DG014 There is no reference node row information available
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SEPMH_DG015 Cyclic dependency detected for attribute &1-&2
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.