Hi,
Do you have Document Management System configured in your system.
If yes then there are 2 ways to attach certificate to inspection lot or to the batch.
If you want to attach certificate to the inspection lot follow the below procedure
1) In material master configure a key which requires certificate and assign a certificate type
2) While doing the GR system asks whether a certificate has been received or not,Say Yes and do the goods receipt.
3)Go to QC55 transaction and against this GR and inspection lot you can assign the scanned copy of the certificate in the Object for Service link.
Alternatively if you material is managed in batched then you can attach the certificate in MSC2N transaction.For this you have to allow document attachment in customization against a batch.
CSN