How To Fix CNV_20700042 - Temporary duplicates occur for material number &2; see long text

CNV_20700042 - Overview

• Message type: E = Error

• Message class: CNV_20700 - Material number conversion

• Message number: 042

• Message text: Temporary duplicates occur for material number &2; see long text

What causes this issue?

Material number &V1& is to be renamed to material number &V2&. Material
number &V2& exists in the system, and will be renamed to &V4&. This will
cause <DS:TX.CNV_MBT_TEMP_DUPLICATES>temporary duplicates</>.

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

System Response

Warning

How to fix this error?

Check your mapping table for correctness.
If the mapping is correct, be aware that the conversion runtime might be
longer.
Otherwise correct the mapping values.
If the runtime is critical, we recommend to avoid temporary duplicates
and change the mapping values.
The indicator "Conversion: No temporary duplicates during conversion" (
CNVPACK-KEYCHVIEWS ) for the current package( 9xxxx ) is set to
"Space". Otherwise, errors due to "Duplicate Keys" may occur during the
conversion.

Error message extract from SAP system. Copyright SAP SE.

CNV_20700042 - Details

• The SAP error message CNV_20700042 indicates that temporary duplicates have been detected for a material number during a data migration or conversion process. This error typically arises in the context of using SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data transfer methods.
  
  Cause:
  The error occurs when the system identifies that there are multiple entries for the same material number in the data being processed. This can happen due to:
  
  Duplicate Data: The source data may contain duplicate entries for the same material number.
  Data Transformation Issues: During the transformation of data from the legacy system to the SAP system, duplicates may inadvertently be created.
  Incorrect Mapping: If the mapping of fields is not done correctly, it can lead to the creation of duplicate records.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Source Data: Review the source data for duplicates. You can use tools like Excel or