Add a note saying the incremental import does not support multiple no…

…de IDs

modules/ROOT/pages/tools/neo4j-admin/neo4j-admin-import.adoc

@@ -1291,6 +1291,13 @@ This also implies using `string` as `id-type`.
 For each `ID` column, you can specify to store its values as different node properties.
 However, the composite value cannot be stored as a node property.
 
+[NOTE]
+====
+Incremental import doesn't support the use of multiple node identifiers.
+This functionality is only available with a full import.
+====
+
+
 .Define multiple IDs as node properties
 ====
 You can define multiple `ID` columns in the node header.