suggestion for revaluating cost for ECP version 0 in CJ9ECP/CJ20N

suggestion for revaluating cost for ECP items in CJ9ECP/CJ20N.

Can any one say how to handle pop up window in CJ20N/CJ9ECP when clicked edit ecp button. Later how to revaluate cost estimates. For this should i need to go for call transaction or is there any method available. If so how to handle method for revaluating cost estimates for ECP of WBS elements