Campaign costs analysis

Hi experts,

we are working on CRM 5.0 and ECC 6.

In our implementation we are not using Project Systems(PS) and SEM-BPS(Business Planning and Simulation) so that the hierarchical structure of all Campaigns/Campaign elements will not be transfered to ECCor R/3.

But we want the actual costs associated with the Campaign to be entered in the Campaign.Later used for analytical purposes to calculate cost per Transaction.

Any one please let me know how to achieve this????? its a kind of urgent.

Thanks in advance,

Regards,

DV.