Vendor Evaluation - Quality

We have Implemented Vendor Evaluation,

For quality our Criterion are

02 Quality

Subcrit/Method

1 Insp. Automatic Determination EM 7. from statistical and quality

2 Quality Notif 8 determ. autom. Statistical quality: quality messages.

Weigth for each one is 5

The main problem that we have about this, that is not clear how MM Vendor Evaluatio, take the quality rate, for example , the quality rate from vendor evaluation, are not consistent, we have 4 Quality Notification for a vendor in the current month and this situation not appear reflected in the quality rate.

We run ME61 , ME63, ME6G and cheq S013 table (Statistics for SIC supplier evaluation), and these notification not appear!

Please help me to found the main problem to solve this situation

Regards