Experience letter for OMSB job

hello friends,
firstly i would like to declare that i hv cleared my OMSB prometric for General Dentist on 26th May'15..i wud like to thank you all my friends n well-wishers on Expatblog n its team,who hv helped a great deal,to clear my exam..
"THANK YOU VERY MUCH"
secondly,now for certificate verifications,i hv to apply to Dataflow..all is fine till now.
But they hv mentioned i hv to present my Experience Certificate from my former employer..
But the thing is,I have 10years of Clinical experience,of which for 7 years,i had my own private clinic..
now for these 7years,from where sud i b getting the experience certificate?
Is there any other alternate for dentists,who had their own private practise?
your guidance and opinions are welcomed..