deletion of revision level and change number -BOM

Dear Team,

I have created change number fro BOM using CC01 transaction and assigned this number to Revision level using CC11 Transaction . After this a

revision level 2 is created since 1 is already exists . now i want to delete this revision level 2. since by mistakenly i have created Revision level 2 which is not required

i.e.

revision level to be deleted which has been already assigned to a change number.

I have tried this by using CC02 - Change master - Delete.but system

throwing message CC225 YOU CANNOT DELETE (CHANGES TO MATERIALS EXISTS)

and Message CC007 - BOM changes exist for change no. & - it cannot be deleted

Please suggest a solution

Regards,

Satya