Changing class for Material

Hello Experts,

I am facing issue while deleting Batch class through CL24N error is Assignment cannot be deleted,

prior to this i have deleted the class from all batches visible in MMBE through MSC2N. but i can see there are more batches in MCHA table which do not have stock as seen in MMBE, Question is do i have to check these batches also for the classification and then after removing i can do CL24N deletion?

Please advice

Thanks