Want to reduce partition by moving to default partition present in table, for that created function which copies the data from partition id to default one but its failing with the error

   CREATE OR REPLACE FUNCTION move_and_drop_partitions(partition_ids integer[])
RETURNS void
LANGUAGE plpgsql
AS $function$
DECLARE
    partition_id integer;
    partition_name text;
begin
    RAISE NOTICE 'Processing Started: %', partition_ids;
    -- Loop through each partition ID
    FOREACH partition_id IN ARRAY partition_ids
    LOOP
        -- Construct the partition name
        partition_name := 'schedule_lines_' || partition_id;
        RAISE NOTICE 'Processing partition: %', partition_name;
        -- Move data from the current partition to the default partition
        EXECUTE format('INSERT INTO schedule_lines_default SELECT * FROM %I', partition_name);
        RAISE NOTICE 'Dropping Partition %', partition_ids;
        -- Drop the current partition
        EXECUTE format('DROP TABLE IF EXISTS %I', partition_name);
    END LOOP;

EXCEPTION
    WHEN OTHERS THEN
        -- Rollback the transaction in case of an error
        RAISE;
END;
$function$;


SELECT move_and_drop_partitions(ARRAY[109]);

When using the function i am getting error as

SQL Error [23514]: ERROR: new row for relation
“schedule_lines_default” violates partition constraint¶