Error: Object with ID '7660' in collection with ID 'Asset:org.acme.biznet.Handset' does not exist
not enough information as to how you encounter this.
Is this transaction trying to update the ID field ?
Are you trying to update an asset (in the same transaction) that is not yet committed to the ledger ? See -> https://github.com/hyperledger/composer/issues/3425 for an example
Suggest to post the model and the full transaction code / sample data.
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