Releasing/Locking Production Resources/ Tools 
Use
When you create or change a production resource/tool (PRT), you can determine whether it is freely available by using the status. You can thus temporarily lock a PRT, which is for instance defective. The status is taken into account when you
assign PRTs to operations in routings or production orders.
check PRT availability in production
Features
How and why you release an individual PRT, depend on the PRT category.
For Materials , Equipment and Documents you determine whether they can be used as a PRT by setting a status.
Note
If you check PRT availability in production orders,
the system also performs a static inventory audit - it checks whether a sufficient quantity is available at the present time
the system also checks the PRT usage counter for equipment.
For production resources/tools with PRT master records (misc.) you use the status to determine specially,
whether the PRT can be assigned in resource planning, that is in routings and production orders.
whether the PRT is available for production and consequently whether availability checks are permissible in an order.
See also:
LO - Managing Material Master Data
PM - Structuring Technical Systems
CA - Document Management Guide