When attempting to update Job Billing Register within the Job Cost Module, receiving error message:

Record: 0002687 is missing from SY_03.SOA.


0002687 is one of the Job numbers used within the system. Users claim two individuals were entering Job billing data simultaneously and both attempted to print invoices and update close to the same time.

I've already tried replacing the SY_03.SOA file with one from the previous night's backup, but this was unsuccessful. 

Any suggestions?