Settling Differences Through Dialogue It is always better to settle differences by dialogue across the table with the concerned worker. Find out whether the worker's request is justified and can be accommodated, or if the denial of the request is based on ego positions on either side or on the administrative necessity of the organization.
It is not proper to deduct wages for this since he is working in a different shift. However, it does not mean that indiscipline shall be allowed, as the refusal of the worker to work in a particular shift despite instructions amounts to willful insubordination, calling for disciplinary action.
Before taking any action, you need to assess the risk analysis of your industrial relations atmosphere. If the workers are unionized, they may agitate over the issue. Test the waters first by issuing a memo asking him to report for the assigned shift. If he refuses again, issue him a show cause notice asking for his explanation as to why disciplinary action should not be taken against him. Depending on further developments, you can issue a charge sheet and conduct a domestic inquiry.
By now, the employee should understand that the management is serious about indiscipline and will comply with your instructions. However, ensure that it does not escalate into an industrial relations problem and exercise tact to control the situation.
Regards, B. Saikumar