How To Fix CNV_20800187 - All customer numbers present in KNA1 are assigned in mapping

CNV_20800187 - Overview

• Message type: E = Error

• Message class: CNV_20800 - Message class for CNV_20800

• Message number: 187

• Message text: All customer numbers present in KNA1 are assigned in mapping

Self-Explanatory Message

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.

What else can you do?

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.

CNV_20800187 - Details

• The SAP error message CNV_20800187 indicates that all customer numbers present in the KNA1 table (which contains general data for customers) are already assigned in the mapping during a data migration or conversion process. This typically occurs in the context of using SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data transfer tools.
  
  Cause:
  
  Duplicate Customer Numbers: The error may arise if the customer numbers in the source system are duplicated or if they have already been mapped to another entity in the target system.
  Mapping Table Issues: The mapping table that is supposed to link source customer numbers to target customer numbers may not have the correct entries or may be fully populated.
  Data Integrity Issues: There may be issues with the integrity of the data being migrated, such as missing or incorrect entries in the mapping table.
  
  
  Solution:
  
  Check Mapping Table: Review the mapping table to ensure that it