Hi David,
By saying that the value type to assign is an integer, you probably mean a 1 or a 0?
In the database booleans are stored as a bit, a 1 or a 0. When you query the data, Outsystems converts this to a boolean. In an advanced query, you can assign that to a boolean field in the output structure.
So maybe you should change the structure such that you've got a boolean value to assign the the checkbox.
To just answer your question: No, you cannot put it like that. The Variable needs to be a boolean.
Regards,
Lennart