Message type: E = Error
Message class:  MMRP01 - Rapid Planning Matrix 
Message number: 451
Message text: Product &2 lies in the individual customer segment (use &1)
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 MMRP01451 indicates that a product (material) is assigned to a specific customer segment, and the system is informing you that the product is not available for the operation you are trying to perform. This typically occurs in the context of sales and distribution or material management processes.
Cause: The error message MMRP01451 usually arises due to one of the following reasons: Customer-Specific Assignment: The product is restricted to a particular customer segment, meaning it is not available for general sales or distribution to all customers.
Configuration Issues: There may be configuration settings in the system that restrict the product's availability based on customer segments. Master Data Issues: The material master data may not be correctly set up for the intended customer segment.
Solution: To resolve this error, you can take the following steps: Check Customer Segment Assignment: Verify the customer segment assignment for the product in question. You can do this by checking the material
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
MMRP01450 Time series could not be generated. Wait &1 seconds.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
ME883 Not possible to determine an exchange rate (Please check your input)
What causes this issue?  For the system to be able to determine an exchange rate, it needs to know the currency, the current date, and the exchange ra...
MMRP01452 RPM time series generated
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
MMRP01499 No matrix could be locked
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.