Hello Landon,
This is a bit confusing, but let me try to explain.
An Identifier is a Data Type by itself. So, the ComissionID, that I presume is an Identifier for the Comission Entity, is the Data Type Comissiong Identifier. The "underlining" data type is an integer, but when comparing variables/attributes that have an Identifier data type with something else, the platform does not use the "underlining" data type, to be able to detect wrong comparisons (e.g. ComissionID = OrderID, even if both are integers, would probably be an error).
Hope this helps clarify why you are getting this warning.
You can safely ignore this warning in this specific situation.
Cheers.