Update modules/ROOT/pages/import.adoc

Author: NataliaIvakina

modules/ROOT/pages/import.adoc

@@ -1520,7 +1520,9 @@ aa11,WORKS_WITH,bb22
 [role=include-with-multiple-ID-columns label--new-2025.07]
 ======
 
-Starting from 2025.07, you have to use a matching number of `START_ID` / `END_ID` columns when defining the relationship:
+Starting from 2025.07, you can use a matching number of `START_ID` / `END_ID` columns when defining the relationship.
+However, do not mix how to refer to composite IDs.
+Either all references must use a single `START_ID` / `END_ID` column or all references must use a matching number of them.
 
 .relationships_header.csv
 [source, csv]