Different client, &, in record &

What causes this issue?

In one record in the imported file, the system has determined that the
client specified does not match this client.

System Response

No table entries have been made in the system.

How to fix this error?

Check the record specified. You can correct the record and place it in a
new data file and import this data file. Alternatively, you can enter
the data in the system using the appropriate maintenance transaction.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.