Hans,

according to Boris Doubrov (one of the developers of the veraPDF parser
for PDF/A validation) the subtype of the /OutputIntent dictionary for
all PDF/A intents should be GTS_PDFA1 (no GTS_PDFA2 or GTS_PDFA3).

Here is his reply for reference:
https://github.com/veraPDF/veraPDF-parser/issues/317#issuecomment-338613962.

The attached patch fixes the issue. I have tried it myself and it solves
the problems with color space profiles.

Could you apply it to ConTeXt?

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
--- mkiv/lpdf-fmt.lua	2017-10-19 13:54:58.000000000 +0200
+++ lpdf-fmt.lua	2017-10-23 18:18:10.528400281 +0200
@@ -355,7 +355,7 @@
             pdf_version             = 1.7,
             format_name             = "pdf/a-2a",
             xmp_file                = "lpdf-pda.xml",
-            gts_flag                = "GTS_PDFA2",
+            gts_flag                = "GTS_PDFA1",
             gray_scale              = true,
             cmyk_colors             = true,
             rgb_colors              = true,
@@ -379,7 +379,7 @@
             pdf_version             = 1.7,
             format_name             = "pdf/a-3a",
             xmp_file                = "lpdf-pda.xml",
-            gts_flag                = "GTS_PDFA3",
+            gts_flag                = "GTS_PDFA1",
             gray_scale              = true,
             cmyk_colors             = true,
             rgb_colors              = true,
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