Here, as per the ESI Act, the employer has to cover the ESI to all employees working in the organisation.
Since the Principle employer have an obligation to apply the legilation to all employees including contract labour, he has to show the proof of contributions paid as per the act while inspection.
Moreover, if the contractor fails to cover their employees, the principle employer is fianlly responsible.
In this regard, you can give proof of challan paid and contribution details of your employees under contract labour.
You need not take seperate code or seperate challan for this.
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