exception while deleting item in ordered list

• list in list in yang model

while deleting via restconf item in inner (ordered-by user list)

exception is thrown

Caused by: java.lang.IllegalArgumentException\n\tat com.google.common.base.Preconditions.checkArgument(Preconditions.java:76)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy$OrderedMapModificationStrategy.createBuilder(NormalizedNodeContainerModificationStrategy.java:271)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.applySubtreeChange(NormalizedNodeContainerModificationStrategy.java:155)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy$OrderedMapModificationStrategy.applySubtreeChange(NormalizedNodeContainerModificationStrategy.java:254)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.apply(SchemaAwareApplyOperation.java:209)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.mutateChildren(NormalizedNodeContainerModificationStrategy.java:126)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.applySubtreeChange(NormalizedNodeContainerModificationStrategy.java:157)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.DataNodeContainerModificationStrategy$ListEntryModificationStrategy.applySubtreeChange(DataNodeContainerModificationStrategy.java:133)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.apply(SchemaAwareApplyOperation.java:209)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.mutateChildren(NormalizedNodeContainerModificationStrategy.java:126)\n\tat org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.applySubtreeChange(NormalizedNodeContainerModificationStrategy.java:157)\n\tat

org.opendaylight.yangtools.yang-data-impl-0.6.2-20140922.164315-768.jar