It is always good for us to have as much information as possible. However, if you are missing some information from your co-writers, this is okay as long as you know the split percentages.
You must enter all writers (whether Songtrust or outside) into your account before you can register a song.
Common information you may not have access to could include IPI#, PRO, and publishing company. If you do not have this information, just leave it blank when adding an outside writer. If you click on "Add Songwriter" a second time after you are asked if you are sure you do not have this information, the songwriter will be added regardless. A first and last name is enough.
However, the splits on each song MUST add up to 100%, so you must know the other writer's percentage of the song.
We highly suggest you enter as much information as possible when adding outside writers. If you do not have any information, you may enter the writer as an "unknown writer" as pictured below:
Here you can see a full demo on how to add a songwriter.
You can also see a full demo on how to add a song.