Oracle Manufacturing provides three types of firm orders:
Firm MRP Planned Order
A firm MRP planned order represents a planned replenishment that is "firmed" using the Planner Workbench for MRP planned items. This allows the planner to stabilize portions of the MRP without creating discrete jobs or purchase requisitions. Unlike a firm scheduled receipt described below, a firm MRP planned order does not implicitly create a time fence for an item unless you set the MRP:Firm Planned Order Time Fence profile option to Yes.
Depending on the overwrite options you choose when launching MRP, you can either allow the planning process to delete firm MRP planned orders, or restrict it from making any recommendations against them.
Firm MRP Implemented Order
An order can be firmed during the load process into WIP when releasing implemented planned orders via the Planner Workbench, or you can use forms provided by Oracle Work in Process and Oracle Purchasing to firm discrete jobs and purchase orders individually. An order is firmed so that the planner responsible for the item can take manual control of the material replenishments. Once a firmed implemented order is released, the planning process treats it as a firm scheduled receipt.
A firm status on a discrete job or purchase order automatically creates a time fence for an item if it exists beyond the predefined planning time fence.
Firm Scheduled Receipt
A firm scheduled receipt represents a replenishment order that is not modified by the planning process. It may be a purchase order or discrete job for a DRP (for Supply Chain Planning users), MPS or MRP planned item. A firm scheduled receipt is not subject to the overwrite options you choose when launching a plan. An order can be firmed during the load process into WIP when releasing implemented planned orders via the Planner Workbench, or you can use forms provided by Oracle Work in Process and Oracle Purchasing to firm discrete jobs and purchase orders individually.
Note: If a job is released and firmed, and the component requirement is past due - the due date of the order is moved to the plan date.