prolog rule

[edeita2]

I am practicing some prolog, below is my code for a prolog predicate(rule) to check the inventory levels, so I try to write a reorder predicate which takes "Part" as an argument and print a message 'Time to reorder' if the inventory level is less than 10, it should normally print that, if it is true, but I`m having some difficulties, could anyone show me where I go wrong?
here`s the rule(prolog predicate):

code:
inventory(part1, 10).
inventory(part2, 7).
inventory(part3, 30).
inventory(part4, 73).
inventory(part5, 3).
reorder(Part):-inventory(Part,Y), Part is (Y < 10), write('time to reorder').

 

[edeita2]

Solution for: prolog rule
I found out where I went wrong myself, here`s the solution for future Prolog victims:

code:
inventory(Part, Quant):- Quant < 10.
reorder(Part):-inventory(Part, Quant),Quant < 10, write('Time to reorder!').


result of prolog session:

code:
| ?- reorder(Lessinquantity).
Time to reorder!
Lessinquantity = part2
Time to reorder!
Lessinquantity = part5


I`m grateful to myself, thank you myself for helping me !