LOL...first time for me. I walked into the local CalVet office (California) to get info on applying for disability ( I got out in 1970) so I'm fresh meat but learning real quick. The vet service rep. said we can fill the 526 form now as I already had filed a intent to file form a couple of weeks ago. Exposure to agent orange and other toxics two different bases. Had prostate CA surgery 2011 and secondaries now. He put a few claim descriptions in wrong and left a biggy out. Spent half a day trying get the right VA contract web or phone number for the VA ect...ect. 4 days of web studies and surfing through all the good and bad info. Some fun.
Anyway I did consider redoing the 526 and doing as you said. I finally got ahold of a real person the VA back east this morning she confirmed the 526 was on file and she suggested using a VA 21-4138 for the corrections. Then sending (FAX) it to Claims VA Center Intake. However, that alone would be difficult to explain and it (the first 526) was only posted to the VA fives days ago so I'm going to do one of your suggestions refile the 526 as a correction AND the 4138 with an basic explanation.
I'll post any results that come back. likely none for 5 months to a year as slow as they are.
Cheers all.