Additional Field in PO creation module - to measure PR/ PO quality[me21n]

Dear SAP Users,

i am seeking for a possibility to add new / or use the already existing field in SAP tcode ME21N to add an internal mark to measure the quality of the PO/PR data.

In other words - to have this data later on in report ( example: ME2N, ME2N or similar)

- how many PO's have been correctly raised by the requstor and how many not.