Caused by: javax.jcr.ValueFormatException: Multivalued property can not be set to a single value (an array of length one is OK): property /ametys:root/ametys-internal:sites/45/7d/www/ametys-internal:contents/19/6a/nouveau-exhaustif/ametys:longmult
	at org.apache.jackrabbit.core.PropertyImpl.checkSetValue(PropertyImpl.java:274)
	at org.apache.jackrabbit.core.PropertyImpl.setValue(PropertyImpl.java:726)
	at org.apache.jackrabbit.core.NodeImpl$SetPropertyOperation.perform(NodeImpl.java:2058)
	at org.apache.jackrabbit.core.NodeImpl$SetPropertyOperation.perform(NodeImpl.java:2002)
	at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:216)
	at org.apache.jackrabbit.core.NodeImpl.setProperty(NodeImpl.java:1924)
	at org.apache.jackrabbit.core.NodeImpl.setProperty(NodeImpl.java:1894)
	at org.ametys.plugins.repository.metadata.jcr.JCRCompositeMetadata.setMetadata(JCRCompositeMetadata.java:843)