scenario: user exit

hi all,

my transaction code name : S_ALR_87012936 - Depreciation on Capitalized Assets (Depreciation Simulation)

package for the transaction code : RTTREE

PROGRAM NAME : RASIMU02 ( SAP standard production program)

package for this program : AB (asset accounting)

My requirement is i want to add field to the report between objectid and object description

i want to know this requirement is which type of exit?how can i resolve this problem, if exit is not existing then what is the alternative procedure for this query.

i m trying to findout the exit by using transaction, package, i m getting exit does not fine like this , how can i do?

plz send me a replies