This means the STi User Ref against the worker is already in use against another worker in STi.
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Each STi user ref can only be used once and associated against a single worker record.
Payroll Starters Error - STi user ref already in use
Learn what to do if, when attempting to Payroll start a worker, you get the following: Error: STi user ref already in use in the web holding area
Written by Terence Cassidy