how to repeat thead after page break

Hello,

I have to work with an already developped FOSI environment (xxx.style) Arbortext Editor Styler 6.0

My problem is that thead is not repeated after page break in the tables, there is just the first thead at the beginning of the table, and nothing after the page break.

Where could I found a method to have thead at the beginning of every new page of the table ? 

where is it configured ? is it in table ? in tgroup ? in thead ? in tbody ?

Thanks in advance, and sorry for my bad english...