Legal clarification regarding mandatory engagement of local manpower in assam

We are contractor based in West Bengal and our company has recently been awarded an Operation & Maintenance (O&M) contract for an industrial facility located in the State of Assam. In the Purchase Order / Contract agreement, there is no clause or condition mentioning mandatory engagement of local manpower or any fixed percentage of local employees. However, during the mobilization stage, the client is insisting that we must recruit 100% local manpower, including skilled and executive positions. This requirement is being communicated verbally and through informal correspondence, but it is not part of the contractual terms. In this context, I would like to seek legal guidance on the following points: Is there any law or statutory requirement in the State of Assam that mandates private contractors to employ a fixed percentage (or 100%) of local residents? Does any labour law or state regulation apply to executive, skilled, or technical manpower in private industrial contracts? If such a requirement is not mentioned in the contract or purchase order, can the client legally enforce a 100% local manpower condition after award of the contract? What would be the appropriate legal position of the contractor if such a condition is imposed later, outside the agreed contractual terms? The query is purely for legal understanding and compliance purposes. Any guidance from legal professionals familiar with Assam labour laws or industrial regulations would be highly appreciated.