Sanna,
I have discovered that the Notfy Related Component of Property Value Change custom attribute MUST have the "Related Class Name" field explicitly defined - IE oppid:PIPING_COMPONENT.
In my case I did not have to do this to the OBJECT_HAS_INSTRUMENT notify node so for this I would verify all your settings.
See the revised attached document.
I hope this helps,
Tony DeRosa
Bentley Plant
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