- Assign Production Work Center in Equipment Master
- While creating PM Order, assign the System Condition as "Not in Operation"
- Create Production Order with same Production Work Center & with same dates as of PM Order
- In Capacity Planning, system will provide the proposal saying that Work Center is occupied by the Maintenance, but this can be over ruled.
If you want to restrict the creation of Production Order during that time, you need to use User Exit / Development. There is a thread in my previous reply which tells you about that exit.