Documentation.

h2/src/main/org/h2/constant/ErrorCode.java

@@ -1721,9 +1721,12 @@ public class ErrorCode {
     /**
      * The error with code <code>90127</code> is thrown when
      * trying to update or delete a row in a result set if the result set is
-     * not updatable. Result sets are only updatable if the statement was
-     * created with updatable concurrency, and if the result set contains
-     * all columns of the primary key or of a unique index of a table.
+     * not updatable. Result sets are only updatable if: 
+     * the statement was created with updatable concurrency;
+     * all columns of the result set are from the same table;
+     * the table is a data table (not a system table or view);
+     * all columns of the primary key or any unique index are included;
+     * all columns of the result set are columns of that table.
      */
     public static final int RESULT_SET_NOT_UPDATABLE = 90127;