Assembly order strategy 81 components exception message 40

Dear Team,

I am using planning strategy 81 for discrete manufacturing process.Planning is taking care for finished product and triggering planned order. But in component level requirement is not generating and showing exception message as 40. If i execute MD02, then working well. Let me know why requirements are not generating for components in MD04 screen. Is it required  MRP run for components even in assembly order process.?

For components  collective requirement  2 using.

I would greatly appreciate if you identify the issue 

Regards

Abhilash