Message type: E = Error
Message class:  SEPMH_DG - EPM HANA DG - Messages 
Message number: 023
Message text: Lambda value for Poisson distribution has not yet been specified
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_DG023 indicates that a lambda value for the Poisson distribution has not been specified in the context of a statistical analysis or calculation that requires it. The Poisson distribution is commonly used in scenarios where you are modeling the number of events occurring within a fixed interval of time or space, and the lambda (?) parameter represents the average rate of occurrence of these events.
Cause: The error typically arises when: A statistical function or report that requires a Poisson distribution is being executed without a defined lambda value. The configuration or input data for the statistical analysis is incomplete or incorrect. There may be a missing or misconfigured parameter in the relevant transaction or program.
Solution: To resolve this error, you can take the following steps: Specify the Lambda Value: Ensure that the lambda value is defined in the relevant configuration or input fields. This may involve checking the parameters in the transaction or
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
SEPMH_DG022 Poisson distribution (Lambda='&1') exceeds ABAP decimal value range
What causes this issue?  The EPM HANA DG attribute rule 'Poisson distribution' cannot be calculated based on the given Lambda value ( expect...
SEPMH_DG021 Factorial value &1! can not be calculated because '&1' is smaller than 0
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SEPMH_DG024 Invalid attribute value
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
SEPMH_DG025 Field '&1' is not of type Integer - attribute rule does not apply
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.