Materials reservation in a subcontracting order

Hi:

I have a question... we are working with a subcontracting order, when we create it trough CO01 the components are not reserved automatically by order, so  when we consult MMBE we do not see the quantity reserved in the column Reserved of the material, but if consult in the RESB table we can see the code numer, quantity, and position.

The Movmement Type that moves the material is Part Provided 543.

Any idea of the solution.

Thanks in advanced.