Tikz: draw two paths between a pair of objects

Question

I want these arrows to be parallel.
Why isn't yshift working the same way on the start and end of the path?
Is there a better way to choose locations on the boxes? Is there an anchor for halfway up one edge of the box? What about the corners?
Thanks!!
documentclass{standalone}

usepackage{newtxtext}
usepackage{tikz}
usetikzlibrary{shapes,arrows}

begin{document}

tikzstyle{box} = [rectangle, draw, minimum height=6cm, text width=3cm, text centered, rounded corners]
  tikzstyle{line} = [draw, -latex']
  
  begin{tikzpicture}[node distance = 6em, auto]
    
    node [box] (box-a) {BOX A};
    node [box, right of=box-a, node distance=6cm] (box-b) {BOX B};
    
    path [line] ([yshift=+5cm] box-a) -- node [midway, above] {Path 1 Above} node [midway, below] {Path 1 Below} ([yshift=+5cm] box-b);
    path [line] ([yshift=-5cm] box-a) -- node [midway, above] {Path 2 Above} node [midway, below] {Path 2 Below} ([yshift=-5cm] box-b);
    
end{tikzpicture}

end{document}

MWE on GitHub

Sigur · Accepted Answer

Since the node is 6cm tall, add 5cm could be too much. Maybe is .5cm what you wish.
Is this what you want?
documentclass[border=1pt]{standalone}

usepackage{newtxtext}
usepackage{tikz}
usetikzlibrary{shapes,arrows}

begin{document}

tikzstyle{box} = [rectangle, draw, minimum height=6cm, text width=3cm, text centered, rounded corners]
  tikzstyle{line} = [draw, -latex']
  
  begin{tikzpicture}[node distance = 6em, auto]
    
    node [box] (box-a) {BOX A};
    node [box, right of=box-a, node distance=6cm] (box-b) {BOX B};
    
    path [line] ([yshift=+.5cm] box-a.east) -- node [midway, above] {Path 1 Above} node [midway, below] {Path 1 Below} ([yshift=+.5cm] box-b.west);
    path [line] ([yshift=-.5cm] box-a.east) -- node [midway, above] {Path 2 Above} node [midway, below] {Path 2 Below} ([yshift=-.5cm] box-b.west);
    
end{tikzpicture}

end{document}

js bibra · Answer

documentclass{standalone}

usepackage{newtxtext}
  usepackage{tikz}
  usetikzlibrary{shapes,arrows}

begin{document}

tikzstyle{box} = [rectangle, draw, minimum height=6cm, text width=3cm, text centered, rounded corners]
  tikzstyle{line} = [draw, -latex']
  
  begin{tikzpicture}[node distance = 6em, auto]
    
    node [box] (box-a) {BOX A};
    node [box, right of=box-a, node distance=6cm] (box-b) {BOX B};
    
    foreach i in {0,30,45, 55, 60,90}{
    path [line] (box-a.i) --  (box-b.180-i);
    }
    foreach i in {0,30,45, 55, 60,90}{
    path [line] (box-a.-i) --  (box-b.180+i);
    }
    
end{tikzpicture}

end{document}

Ignasi · Answer

You can use an auxiliar coordinate and perpendicular (|-, -|) references to fix the end.
path [line] ([yshift=+5mm] box-a.east) coordinate (aux)--(aux-|box-b.west);

This is a path which starts at aux and stops at the intersection place where an horizontal line through aux and a vertical line through box-b.west cross.
documentclass[border=2mm]{standalone}

usepackage{newtxtext}
usepackage{tikz}
usetikzlibrary{shapes,arrows}

begin{document}

tikzstyle{box} = [rectangle, draw, minimum height=6cm, text width=3cm, text centered, rounded corners]
  tikzstyle{line} = [draw, -latex']
  
  begin{tikzpicture}[node distance = 6em, auto]
    
    node [box] (box-a) {BOX A};
    node [box, right of=box-a, node distance=6cm] (box-b) {BOX B};
    
    path [line] ([yshift=+5mm] box-a.east) coordinate (aux)-- node [midway, above] {Path 1 Above} node [midway, below] {Path 1 Below} (aux-|box-b.west);
    path [line] ([yshift=-5mm] box-a.east) coordinate (aux) -- node [midway, above] {Path 2 Above} node [midway, below] {Path 2 Below} (aux-|box-b.west);
    
end{tikzpicture}

end{document}

Tikz: draw two paths between a pair of objects

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