Message type: E = Error
Message class:  CNV_20200_CHECK - Messages for check functions (company code merge) 
Message number: 285
Message text: Merge of house bank ID's
Merge of house bank ID's.
There are duplicate house bank IDs in the systems.
Warning
The business processes in bank accounting must be analyzed for these
conflicts. Check whether the duplicate house banks in the participating
company codes refer to the same bank. If this is not the case, that is,
if the same house bank refers to different objects, the house bank ID
must be renamed during the company code merge. To do this, you must
specify mapping values.
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_20200_CHECK285 typically occurs during the data migration process, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error is related to the merging of house bank IDs, which are used to manage bank accounts in SAP.
Cause: The error message indicates that there is an issue with the merging of house bank IDs. This can happen due to several reasons, including: Duplicate House Bank IDs: The system has detected that there are duplicate house bank IDs in the data being migrated. Inconsistent Data: The data for the house banks may not be consistent, leading to conflicts during the merge process.
Configuration Issues: There may be configuration settings in the system that are not aligned with the data being migrated.
Solution: To resolve the CNV_20200_CHECK285 error, you can follow these steps: Check for Duplicates: Review the house bank IDs in your source data to ensure there are no duplicates. If
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