Message type: E = Error
Message class:  CNV_20900 - Message class for package CNV_20900 
Message number: 063
Message text: Participating vendors have different Bank account number (LFBK-BANKN)
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
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
have identical master data settings: It was found that old vendor
records have different 'Bank account number'. (This is determined by the
indicator 'Bank account number', field LFBK-BANKN).
This may lead to inconsistencies in some applications related to target
vendor data.
<ZH>Error</>
From a technical perspective, this message can be ignored. This may make
sense in the following cases:
No postings to the respective vendor records have been made.
The respective vendor records are not used any longer and are meant to
be merged into a dummy record
Analyze the situation, and either change the mapping so that only vendor
records with identical master data settings are merged or decide to
ignore the message because one of the special cases described above
applies.
If you decide to ignore the error even though none of the special cases
described above applies, consider that  <ZH>the target vendor record
will get the Bank account number of the old vendor record for which
priority the indicator is set. </>Make sure to evaluate the impact of
this decision - for example regarding potential inconsistencies and
required follow-up activities - <ZH>before</> you continue with the
conversion.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20900063 indicates that there is a discrepancy in the bank account numbers (LFBK-BANKN) for participating vendors during a data migration or conversion process. This error typically arises in scenarios where multiple vendors are being processed, and the system detects that the same vendor is associated with different bank account numbers across different records.
Cause: Data Inconsistency: The primary cause of this error is inconsistent data in the vendor master records. For example, if a vendor is listed with different bank account numbers in different records, the system will flag this as an error. Duplicate Vendor Entries: There may be duplicate entries for the same vendor with different bank account numbers. Incorrect Mapping: During data migration, if the mapping of vendor data is not done correctly, it can lead to this error.
Solution: Data Review: Review the vendor master data to identify any inconsistencies. Check the bank account numbers associated with each vendor. Consolidate
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