BPC NW 7.0 Maximum property length

Hi all!

I need to use property OWNER for an Entity dimension for work statuses use.

I need to know the maximum length for this property.

As I can see while processing dimension elements it's 255 symbols long. If I make it longer then I see "########" in this field.

However, while processing properties of the dimension I can set length of the owner property more then 255. I set "2000" and processed successfully.

I see contradiction here and can't understand what the maximum property length is.