The collection already includes a column with the schema name of another column in the Order Products table, cra00_productname which is a text field. cra00_requestedby is a lookup field to User and cra00_order is text field. Requested By and Order columns are supposed to be the same for all items being patched, which is why I'm using AddColumns instead of adding it to the collection.
The warning I am getting is in the AddColumns section. It says "The specified column 'cra00_requestedby' does not exist. The column with the most similar name is 'Requested By'". cra00_requestedby is the schema/internal name of the table in CDS while Requested By is the display name. I also tried to change it to use the display names in AddColumns, as referenced in the warning message. This just changes the error message to "The specified column 'Requested By' does not exist. The column with the most similar name is 'Requested By'". I can get similar message to surface if I delete the Requested By portion on the Order column.
The strange thing is that since this is just a warning, I tried it anyway. The Order will patch as expected but the Requested By will not, that column is just blank for the new records. There are no errors when clicking the button through the studio.