Needs two threads (Heman vs Heman, Sr. and Heman vs Heman, Jr.) because the common name for one is not relevant to the common name for the other.

There is already approved birth years to separate the two, regardless of the common name.

And I can confirm that "Roger Heman" is credited for sound in the following:

The Black Swan (1942)
Call Northside 777 (1948)
Charley's Aunt (1941)
Demetrius and the Gladiators (1954)
How Green Was My Valley (1941)
I Was a Male War Bride (1949)
Miracle on 34th Street (1947)
Les Misérables (1935)
Les Misérables (1952)
The Ox-Bow Incident (1943)
The Rains Came (1939)
Rawhide (1951)
The Robe (1953)
Second Honeymoon (1937)
Son of Fury: The Story of Benjamin Blake (1942)
This Above All (1942)

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It is absolutely Roger Heman, minus the Sr.  He didn't really start using that until late in his career.  Personally, I use both the Sr and the Jr locally simply because it seemed just plain silly to bother with birth years since there was this nice obvious delineator.  If you insist on a comprehensive list, I can confirm the following, all as Roger Heman:

As Young as You Feel
The Gorilla
Belles on Their Toes
Blood and Sand
Cafe Metropole
Captain from Castile
Cheaper by the Dozen
Day-Time Wife
The Dolly Sisters
Down Argentine Way
Drums Along the Mohawk
The Gang's All Here
Garden of Evil
Gentlemen's Agreement
Gentlemen Prefer Blondes
Girls' Dormitory
The Grapes of Wrath
Greenwich Village
The Gunfighter
Guys and Dolls
Heaven Can Wait (1943)
The Hound of the Baskervilles
The Adventures of Sherlock Holmes
How Green was my Valley
How to Marry a Millionaire
If I'm Lucky
In Old Chicago
Jesse James
Johnny Apollo
Kiss of Death
Lifeboat
The Lodger
Love is News
The Luck of the Irish
Man Hunt
The Mark of Zorro
Monkey Business
Moon Over Miami
My Darling Clementine
Niagara
Prince of Foxes
The Return of Frank James
River of No Return
Something for the Boys
State Fair
That Wonderful Urge
The Three Musketeers (1939)
Titanic (1953)
Unfaithfully Yours
We're Not Married
Week-End in Havana
A Yank in the R.A.F.
Young Mr. Lincoln

Quoting tweeter:

Quote:
There is already approved birth years to separate the two, regardless of the common name.

There is indeed, but for the record: that's not "regardless of the common name". If one of their common names included the suffix, using a birth year wouldn't be allowed, and the birth years would be put on the "invalid"-list immediately. But since both their common names are "Roger Heman", no suffix, the birth years are needed.

Roger Heman Jr.: 10 Titles
Battle of Midway (1976)
The Concorde... Airport '79 (1979)
The Eiger Sanction (1975)
Family Plot (1976) probably uncredited
Gotcha! (1985)
Jaws (1975) probably uncredited
Midway (1976)
Psycho III (1986)
Slap Shot (1977)
Somewhere in Time (1980)

Roger Heman: 12 Titles
All Night Long (1981)
Coal Miner's Daughter (1980)
Fast Times at Ridgemont High (1982)
Gotcha! (1985)
Heartbeeps (1981)
House Calls (1978)
Psycho II (1983)
Psycho III (1986)
Rage of Angels: The Story Continues (1986)
Raggedy Man (1981)
Somewhere in Time (1980)
Weird Science (1985)

Roger H. Heman, Jr. 1 Title
How to Frame a Figg (1971)

Quoting T!M:

Quote:
Quoting Staid S Barr:

Quote:
I know that's the rule or system, but can someone explain what the problem is?

No, I'm afraid I don't know why we don't just add birth years to everyone - "that's the rule" seems to be all we've got on the matter. Not that I have a problem with it - whenever we need birth years, the current system allows them, so there's no downside - but I don't know why.

Yes, there is a downside.  Let's say that we've researched and determined correct birth years because of duplicate common names.  At some point later, one common name changes and we have to remove the birth year.  We're now removing known good data even though it may be necessary in the future if the common name shifts again.

There is no good reason to remove a BY once it has been verified and approved.

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Well, considering that it can be quite challenging finding the correct birthyear, particularly for older actors, perhaps limiting their entry is a good idea.  There have been any number of times that multiple sources have listed conflicting BYs so it's not exactly the easiest data to find.