Add distribution channel in Already posted Plan Line items in copa

Dear All,

We have made a sales plan by using Excel interface in KEPM and have posted all the plan line items. We did not included the distribution channel in our characteristics of line items. We now want to add distribution channel as a characteristic in already posted plan line items.

Plan Line items are now visible in KE25 with following characteristics, Sales Org,Customer,Material, Price Group.

Please help

Thanks

Nimesh