*"You can only assign one enhancement set per client"*

Hi Experts,

I have created one enhancement set key by using SM34 and assigned to Client. I did some enhancements on my Account management screen.

Today i wanted to do some enhancements on opportunity screen, so i have created one more enahancement set key (SM34) and tried to assign it to my client by using SM30 by clicking on "New Entries". It says "You can only assign one enhancement set per client", so what exactly this means, cant i assign more than one enhancment set key for each client?

If that is the case , whatever enahancments i do now and in future , Can i use the same enhancement key for all my enhancements? Will this create any problem/affect in future for my past enhancements on that particular enhancment set key?

Else,What If everytime i create a New enhancement set key and if i replace it with the old one for the same client in SM30?

Hope my question/ doubt is not confusing.....

Thanks & Regards

Rohan