error while creating Ztable

Hi Friends,

I got a requirement wherein I need to create a Ztable with 4 fileds of type char of length 500. I have used the domain char500 to create . While i was activating i am getting the errors as

Field ADDCOM is too long (Specify a length between 1 and 255)....

Please can anyone help me out to rectify this error.

Is there any other way i can create so.