Transfer Workforce Compensation Data to HR process not successful for three employees

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Hello experts,

I have just launched the Transfer Workforce Compensation Data to HR process, but it failed for three employees.

All the employees have been hired before the Specified date for the Elements for the specified process.

I have downloaded the log file and it is said that the "The salary adjustment failed upon validation". What does this error message mean?

What kind of check do I have to do?

Thanks in advance for your time!

Kind Regards,

Valerio