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Provisioning specific level of QoS in a grid environment represents a central concern in obtaining a flexible and dynamic services management on large scale distributed systems. The recent orientation of grid middlewares towards the concept of trading services, wherein providers and consumers of services are able to negotiate all services parameters, confirms this trend. The introduction of mechanisms to handle the advance reservation in grid, allows the system administrator to manage the resources in an optimal way and guarantees to users about the possibility to obtain a specific resources for a specific time range. This paper proposes a model of advance reservation, integrated within an more general architecture able to manage SLA in a grid environment, based on a priority mechanism for the management of the allocation request. The developed reservation component has been integrated into OpenPBS scheduler.