The ruling, Ron, is:
Since an amendment may not infringe upon the financial initiative of the Crown, it is inadmissible if it imposes a charge on the public treasury, or if it extends the objects or purposes or relaxes the conditions and qualifications specified in the royal recommendation.
That's from the House of Commons Procedure and Practice, Second Edition, at pages 767 and 768.
I ruled that the amendment does propose to increase the value of the said benefit, which could impose an additional charge on the public treasury. Therefore, I ruled it inadmissible.