CHAR12 DataType in PDI/SDK

Dear Masters,

I need a CHAR12 field data type in SDK, with minimum 0 and maximum length 12.

Tried to find it in SDK->View->Repository Explorer. Have many fields with minimum 1 and maximum length 12.

But not finding a data type field with minimum 0 and maximum length 12.

Is there any other way to find it ?? or how can i create a Custom Data type without any list values.?

Appreciate your valuable time and help.

Thanks,

Abdul Kalam.A