Having lived and worked in the Netherlands and knowing its language, I have been interested in the Dutch cinema as well, particularly if Rutger Hauer or Jeroen Krabbé present. There have lots of films on the WWII been made, nicely versatile ones, as the period was one of the most painful and complex in the country's history. Thus, I was eager to learn how the war era was made compatible with such a sensitive topic like man-boy relationship.
But the latter was not much visible in Voor een verloren soldaat (perhaps in the autobiographical novel of the same title - I have not read that); it was even not clearly visible if there was some mutual erotics at all. What we saw was a 20+ years foreign soldier acting as a caring mentor, showing a boy far from home and family new angles of life; besides, I do not believe that showing affection towards a boy would have been normally accepted by both the religious Dutchmen and militant Canadians in those days...
Anyway, the mood in the film is pleasant, performances realistic, and viewers obtain a nice overview of Friesland under slackening Nazi occupation. But do not try to find any sensationalism, as mentioned, it is a good depiction of friendship - with some affection - during a war period when many things and deeds are perceived in another way.