Automatic Purchase Requestition creation for item category "L" (Stock Item)

Hi All,

I have a query,

When components are assigned to a maintenance order whose item category is "L" (Stock Item).

As soon as components are assigned a reservation number is generated by the system immediately.

Now my requirement is,

for an item category which is "L" (Stock item), while I am saving / releasing the order, system should do availability check and based on the qty available it should automatically generate reservation (in case of full qty is available) or a purchase requisitions ( in case of non availability).

Is this feasible? If so kindly let me know how it can be done.

Currently in my case,

i am getting a reservation number for an an item whose item category is "L" but the stock qty is "zero". System should have ideally generated a purchase requisitions number for such a case because of actual available qty being "zero"

Is there any setting called "reservation time" so that after checking the availability of that item system decided whether a reservation number should be generated or a purchase requisition number?

Thanks and with best regards

Kannan J