3508458 - "This external code [xxxxxx] already exists. Try another" error happen when importing business rule in Configuration Transport Center

When importing business rule in target instance, validation failed with error like "This external code [xxxxxx] already exists. Try another".

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

SAP SuccessFactors HCM Suite b2105 and above

Configuration Transport Center, validation error, This external code already exists. Try another, case-sensitive, business rule, full purge , KBA , LOD-SF-PLT-CGC , Configuration Center , Problem