Sub Articulo 41.3

Why are you using supertabular here? 
Supertabular is for splitting a large table across pages, which won't
happen here because you put it in a sidewaystable. But supertabular will
still start a new section when it thinks the page is full, and then it may
change the width of the table (because each sectionb is typeset as a
separate table), unlike longtable which makes all segments the same.
So just use tabular rather than supertabular.