I have this longtable table, where I want to locate two multicolumns after each other. When I compile with the second multicolumn commented out, everything is fine (pic 1). But with two consecutive multicolumns the width of the table is completely changed (pic 2). What's happening?
My question might be a duplicate of Multicolumn width in longtable, but I don't see how the solution can be used in my problem...
MWE:
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{fouriernc}
\usepackage{tabularx,booktabs,parskip}
\usepackage[text={9in,6in},showframe,landscape]{geometry}
\usepackage{setspace,url,multirow,longtable,array}
\usepackage{enumitem}
\setlist{nolistsep}
\renewcommand\labelitemi{--}
\newcolumntype{P}[1]{>{\raggedright}p{\dimexpr#1\textwidth-2\tabcolsep}}
\begin{document}
\begin{longtable}{P{0.05} P{0.05} P{0.3} P{0.3} P{0.15} P{0.15}}
\toprule
\multicolumn{2}{l}{Tema: } & \multicolumn{4}{l}{Geometri} \tabularnewline
% \multicolumn{2}{l}{Kompetansemål i K06: } & \multicolumn{4}{l}{Some text} \tabularnewline
\midrule
Uke & Time & Læringsmål for timen & Arbeidsmetoder & Uformell vurdering & Kjerneord/ begreper \tabularnewline
\midrule
\endfirsthead
%
\multicolumn{3}{c}%
{{\bfseries \tablename\ \thetable{} -- fortsatt fra forrige side}} \tabularnewline
\midrule Uke & Time & Læringsmål for timen & Arbeidsmetoder & Uformell vurdering & Kjerneord/begreper \tabularnewline \midrule
\endhead
%
\midrule \multicolumn{3}{|r|}{{Fortsetter på neste side}} \tabularnewline \midrule
\endfoot
%
\bottomrule
\endlastfoot
46 & 1 & Some stuff & Some more stuff & Utsjekk. & Katet, hypotenus, kvadrat
\tabularnewline
\bottomrule
\end{longtable}
\end{document}
Producing
While without commenting out the second multicolumn the table is way outside the page borders:
