How To Fix CNV_20100216 - Source account &3 already exists; implicit merge

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20100 - Messageclass for chart of account conversion

• Message number: 216

• Message text: Source account &3 already exists; implicit merge

What causes this issue?

When checking the G/L accounts that will be merged, the system found
that the mapping &V1& -> &V2& will result in an
<DS:TX.CNV_20100_TX_IMPLICITMERGE>implicit merge</> with source account
&V3&.
The reason is that source account &V3& is not itself a source account (
&V3& -> XXXX) for another mapping.
Consequently, account &V1& would be merged implicitly with existing
account &V3& at <DS:TX.CNV_20100_TX_ASEGMENT>A level</> as well as at
<DS:TX.CNV_20100_TX_BSEGMENT>B level</>.
This has the following consequences. You need:
to find out if this implicit merge is correct from a logical point of
view
to explicitely include the entry &V3& -> &V2& to the mapping
consider the priority indicator. If the priority indicator is not set,
it is not clear which settings will take priority when accounts &V1& and
&V3& are merged into &V2&.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

<ZH>Regarding item 2:</>
Explicitely include the mapping &V3& -> &V2& in the mapping table so
that at least the following entries exist in the mapping table:
&V1& -> &V2&
&V3& -> &V2&
If applicable, any others with target account &V2&.
This allows the system to check the merge for logical correctness.
A troubleshooting activity is associated to this activity which supports
you in creating the required mapping entries to resolve the implicit
merges.
<ZH>Regarding item 3:</>
Set the priority indicator for one of the entries with target account
&V2&.
&NOTE&
It is possible to do the conversion without setting the priority
indicator. In this case you should check the A segment settings (master
data in chart of accounts, transaction FSP3) and B segment settings
(master data in company code, transaction FSS3) for the affected account
&V2& after the conversion.
&ADDITIONAL_HINTS&
The priority indicator must not be set more than <ZH>once </>for all
merges to a given account. This is also valid for cross-chart of
accounts merges.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20100216 - Source account &3 already exists; implicit merge ?

  The SAP error message CNV_20100216: Source account &3 already exists; implicit merge typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an attempt to create a source account that already exists in the target system, leading to an implicit merge of accounts.
  
  Cause:
  
  
  Duplicate Source Accounts: The error arises when the migration process encounters a source account that has already been defined in the target system. This can happen if:
  
  The same account is being migrated multiple times.
  There are inconsistencies in the source data leading to duplicate entries.
  The mapping of accounts from the source to the target system is not correctly defined.
  
  
  
  Data Preparation Issues: If the data preparation phase did not adequately clean or deduplicate the source data, it could lead to multiple entries for the same account.
  
  
  
  Solution:
  
  
  Review Source Data: Check the source data for duplicates. Ensure