order range for production order type

Dear Team,

We are facing problem in testing client 300 while creating Order Range for Production Types through T-code “CO82”. When we are trying to create any order range

System showing error “Enter intervals without overlap”  it means this order range is already exist but when we try to assign any order type to particular order range system not showing the same order range .

please do needful, take as high priority.

Thanks

Regards

Sudheer k