Hello Sanjay
How come you have same cost center in ECC? Its not possible. Either the one would be inactive with different validity dates.
1. Fist check the entire ECC data and then sort it based on validity
2. Create editions according to ECC validity period.
3. Release oldest edition and then only create new edition and load the data.
You need to follow same process till the time you get the final edition with end date as 9999
Kiran