Vouchers getting matched inspite of deviating tolerance limits

Hi

We do not have receipt functionality in place. Ours is a two way matching. Following is the scernario

1. A PO with 400 amount (amount onlyPO)

2. Created there vouchers with 200 , 100., 130 summing up to 430

We have a rule in place to ensure the amounts are matched for the vouchers and has a tolerance limit of 5%. So the sum of the amounts of these vouchers is beyond the tolerance limit

3. Run the matching process for all the three vouchers in a single run.

4. All the vouchers matched where the expectation is that it should generate an exception.

Any reason for the above behavior. Thanks for your response in advance.