Message type: E = Error
Message class:  CRMS4_SOM_PROD_BO - Messages for BO Subscription Product Specification 
Message number: 051
Message text: Maintain BRFplus function for numeric parameter '&1' (charge plan '&2')
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 CRMS4_SOM_PROD_BO051 typically indicates an issue related to the Business Rule Framework plus (BRFplus) function, specifically concerning a numeric parameter in a charge plan. This error can occur in the context of SAP Customer Relationship Management (CRM) or SAP Convergent Charging (CC) when there is a problem with the configuration of the BRFplus rules that are supposed to handle charge plans.
Cause: Missing or Incorrect BRFplus Function: The BRFplus function that is supposed to handle the numeric parameter for the specified charge plan may not be defined or may be incorrectly configured. Parameter Type Mismatch: The parameter expected by the BRFplus function may not match the data type or format of the value being passed. Charge Plan Issues: The charge plan referenced in the error message may not be properly set up or may be inactive. Authorization Issues: There may be authorization issues preventing access to the BRFplus function or the charge
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CRMS4_SOM_PROD_BO050 Maintain BRFplus function for string parameter '&1' (charge plan '&2')
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CRMS4_SOM_PROD_BO049 Maintain BRFplus function for date parameter '&1' (charge plan '&2')
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CRMS4_SOM_PROD_BO052 Maintain BRFplus function for external object '&1'
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CRMS4_SOM_PROD_BO053 Maintain BRFplus function for date parameter '&1' (ext. object '&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.