Confusing error message

[GerdP]

What steps will reproduce the problem?

1. Validate attached file

What is the expected result?

Validator should complain the the turn restriction is not needed

What happens instead?

It produces an error message: The "from" way does not start or end at a "via" node which doesn't contain
the relation:

Please provide any additional information below. Attach a screenshot if possible.

Build-Date:2019-04-05 10:37:59
Revision:14962
Is-Local-Build:true

Identification: JOSM/1.5 (14962 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1803 (17134)
Memory Usage: 972 MB / 1753 MB (583 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [-agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:51919, -Dfile.encoding=UTF-8]
Program arguments: [--debug]
Dataset consistency test: No problems found

Plugins:
+ FastDraw (34949)
+ OpeningHoursEditor (34867)
+ apache-commons (34506)
+ buildings_tools (34904)
+ continuosDownload (82)
+ ejml (34389)
+ geotools (34513)
+ jaxb (34678)
+ jts (34524)
+ o5m (34867)
+ opendata (34911)
+ pbf (34867)
+ poly (34867)
+ reltoolbox (34867)
+ reverter (34961)
+ undelete (34919)
+ utilsplugin2 (34932)

Last errors/warnings:
- W: JOSM expected to find primitive [way -197748] in dataset but it is not there. Please report this at https://josm.openstreetmap.de. This is not a critical error, it should be safe to continue in your work.
- E: java.lang.Exception
- W: JOSM expected to find primitive [way -197778] in dataset but it is not there. Please report this at https://josm.openstreetmap.de. This is not a critical error, it should be safe to continue in your work.
- E: java.lang.Exception
- W: JOSM expected to find primitive [way -197807] in dataset but it is not there. Please report this at https://josm.openstreetmap.de. This is not a critical error, it should be safe to continue in your work.
- E: java.lang.Exception
- W: JOSM expected to find primitive [way -197807] in dataset but it is not there. Please report this at https://josm.openstreetmap.de. This is not a critical error, it should be safe to continue in your work.
- E: java.lang.Exception
- W: JOSM expected to find primitive [way -197807] in dataset but it is not there. Please report this at https://josm.openstreetmap.de. This is not a critical error, it should be safe to continue in your work.
- E: java.lang.Exception