Match Rule Groups MA00.4

I read the article 76166 that states DM A-1 must be the first rule level set up in the rule group. It states, if the system can match at any other level prior to reaching the DM A-1 level, the functionality will not be available for future invoices against that receipt. ie If the invoice quantity multiplied by the unit cost is less than the receipt quantity multiplied by the unit cost, but is still within tolerance, the system will match at DM 1-1 or DM 1-A and not leave a quantity remaining to match later. 

We are on Lawson 9 and do not have DM A-1 set as the first level in the rule group, do we need to change our setting.  I am new to procurement and not sure if we have been impacted by this decision or not???? Thank you for any quidance