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Account integration errors in production

upsert failed on ship to insert transaction: duplicate value found: Legacy_System_Id__c duplicates value on record with id: 001C000001aktGT
what is this error?
And the account information fields are not updating into Salesforce.com correctly.
For this, I checked all the triggers, Classes, rules and I found nothing about the field that is not updating.
Even I checked in dev Console if there's any duplicate id, But only one row i got.
What might be the reason? Please help.
Is "Legacy_System_Id__c"  field in your Account object an External ID?

External IDs are usually unique. Can you check if this UPSERT of yours trying to create a record with same Legacy_System_Id__c as another record?