When I submitted my Tier 4 visa application form, I put the application number instead of CAS (Confirmation of Acceptance for Studies) number.
I have included a copy of the CAS with my documents. Will I get a visa refusal?
I'm pretty sure that the Border Agency official will be checking the CAS certificate you provided as well as your supporting documents. If all is in order, you should not be refused for inserting the incorrect number on the application form.