Matching process not finding most Match Exceptions

Hi,

We are on PeopleSoft 9.0 and trying to get the matching process to work. It's updating all the Vouchers as Matched - when they clearly shouldn't match.

This is in demo and dev - with Match configuration as delivered from PeopleSoft. We are using 3 way match. And using the delivered Match Rule Control = STANDARD (for use with POs). The Categories (and Items) are set to not allow Tollerances (i.e. the Amounts and Percentages are set to zero).  

Match Rule = RULE_R500 (no receipt) correctly records as Match Exception. But the others i.e. RULE_P500, RULE_R650 etc are recording as Matched (which is incorrect).