This kind of scenario cannot be covered by MRP, because MRP planning is always top down, that means, it first plans the header material and then plans the components.
My suggestion for you is to set a reorder point for for material Y and let MRP always generate a new planned order. Then you run periodically the ATP check on this planned order and only convert it to production order when the total quantity of the component is available.
Regards,
Caetano
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