Material cost not getting displayed in CN41N

Hi Gurus,

When we execute CN41N, Materials assigned to the Network activity are visible but the cost of each material is not getting displayed against it (under Proj. Cost Plan Column) and it is appearing as '0' whereas, it is appearing as an accumulated cost against the activity. I checked SAP notes for this problem, though I could see some notes which are very close to the problem but all are for Release 600 whereas we are using 604 (ECC 6.0). Have anyone encountered such problems or whether the cost will not appear against Material in CN41N.

Awaiting your valuable suggestions.

thanks in advance.

Vinodh