Message type: E = Error
Message class:  CNV_20900 - Message class for package CNV_20900 
Message number: 180
Message text: Participating vendors have different Country (LFA1-LAND1)
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20900180 indicates that there is a mismatch in the country codes (LAND1) for participating vendors in a specific process, typically during data migration or conversion activities. This error is often encountered in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or during the use of the SAP Conversion Tools.
Cause: The error occurs when the system detects that the participating vendors (usually in a transaction or a data migration scenario) have different country codes. This can happen due to: Data Inconsistency: The vendor master data for the vendors involved may have been incorrectly maintained, leading to different country codes.
Configuration Issues: There may be configuration settings that do not align with the expected country codes for the vendors. Data Migration Errors: During data migration, if the source data contains inconsistencies or errors, it can lead to this issue.
Solution: To resolve the error, you can take the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20900179 Check for account group:
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20900178 Check for vendor mapping:
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20900181 Participating vendors have different Deletion flag (LFA1-LOEVM)
 Diagnosis According to the mapping, you want to merge two or more old vendor records into one target vendor record. However, not all the old records ...
CNV_20900182 Participating vendors have different Purchasing block (LFA1-SPERM)
 Diagnosis According to the mapping, you want to merge two or more old vendor records into one target vendor record. However, not all the old records ...
Click on this link to search all SAP messages.