Error in Class Assignment in Pool Asset Managment

Hello Team,

I am facing problem in IW21 during creation Notification type MF which is used for Pool Asset Management. if possible give me solution

After Click on Equipment below window will open

and in this window if i do next, no processing will happened. If i wish to save this notification system will give error Like Error in Class Assignment.

I checked entries in PAMS_FSET table also.

Thanks and Regards,

Sweta