Capacity planning

Hi All,

In the recipe,I have 2 operations for a resource.For first operation the time in standard value is Zero & for second operation I have maintained 24 hrs.

When I create a planned order with this recipe,I see 2 entries for the planned order(for 2 operation).Then When I run MRP and check the planning table,I am not able to see the First operation.This gets dissapeared.Only operation 2 (where I have maintained 24 hrs) is seen in planning table(CM25).

Can any one explain how & why this is happening.