The following example generates a log file which begins with the line

    structure       > lists > out of order sectionsblocks, maybe use
    \setsectionblock

My larger document has over a hundred of these at the beginning.

    \setupnote [endnote] [location=none]
    \starttext
      \startbodymatter
       \startchapter[title={Body}]
        \startparagraph
         \input knuthmath
         \startendnote
         \input knuth-gpt
         \stopendnote
        \stopparagraph
       \stopchapter
      \stopbodymatter
      \startbackmatter
       \startchapter[title={Notes}]
        \placenotes [endnote]
       \stopchapter
      \stopbackmatter
    \stoptext

Can the message be suppressed? Is there a better way to set up the 
document to have endnotes for text in other-than-backmatter 
sectionblocks appear in the backmatter sectionblock?

-- 
Rik