The dam of your horse is not listed in the AMHA studbook so maybe the name is not quite right or is the paperwork for the AMHR ? I do not have an AMHR studbook subscription so can't help but maybe someone else does. You would have to track down the owner of the sire and dam at the time your boy was born and find out if he was on the stallion report, if not a late stallion report would have to be filed. The main thing is if your names and numbers are correct I would call the registry and ask them what to do, they are very helpful. You have to be a member to have this work done. Good luck.