planned material costs not seen in reports

hi to all,

i planned costs for a project using networks and activity elements and material components. for the activity elements i placed the costs as a direct input and for material components, i input the required quantity and the material number. However, when i looked at the structure overview(CN41), the materials i placed have 0 cost. YET THE TOTATL AMOUNT in the network&activity INCLUDES the cost of the material (quantity multiplied by material price).

Thanks in advance