I have a test csv with a few records:
The unique id is RelID (so NOT FamID):
The Data Importer throws an error, stating that there already is a node with FamID "T9":
and as a consequence, nothing is imported:
Does anyone know what is going wrong here?
Thanks.
Does you database have a unique constraint defined for Label Family and property FamID? Execute 'show constraints' in the browser and look for one.
I created that scenario in a test database and got that error during import. Nothing was changed because I assume the error rolled back the transaction, so nothing was persisted.
Hi @glilienfield ,
Thanks again for your help.
It turned out to be a constraint indeed.
Guido
P.S. there is now definite proof that I'm writing code while sleepwalking: I did know about the existence of constraints, but never used them. I didn't even know the syntax... 
