How MRP will work?

Hi All,

Below is the description of the scenario :

Suppose X is a in-house production material. And 'A'(Externally procured material) is one of the components in the BOm for X. Now a SO is created for the X and let the delivery date be 25/06/2012. Based on Goods issue date in SO which I made it to 21/06/2012 a MD04 entry is created(Just to test I made the Production time to 0 days). Now what I want to know is that on what basis the entry for 'A' will be created in MD04(i.e; procurement proposal for A). The Planned delivery time for A is 1 day. I was not able to figure this out, as there were many depreq for the same date in MD04. Can anyone tell me what will be the requirement date and how MRP calculates it?

And, if we know the Planned order is it possible to know from which SO it has been triggered ?

Let me know if any other information is required.

Regards,

Avinash