Component deletion with many-to-one properties

[israelaece]

I'm using the NH 5.3.5 and I continue dealing with #1755 issue (removing composite-element from <set/> collections), but, in my case, the composite-element has three properties, two of them are many-to-one.

Note that my Description property in Item class is not-null="true". When I set this property to not-null="false" the problem goes away, but in terms of my business domain, this property shouldn't be null.

STEP 1: I added two items in parent entity and save it;
STEP 2: After, I load the entity, clear all items and I insert exactly the same item that I removed. DELETE clause generated is:

DELETE FROM ParentItems WHERE ParentId = @p0 AND Description = @p1 AND CompanyId is null

And we can note that PersonId column (Person property) not appear in the WHERE. Like a said, if I change the Description property to not-null="false", the DELETE is:

DELETE FROM ParentItems WHERE ParentId = @p0 AND Description = @p1 AND PersonId = @p2 AND CompanyId is null

The full reproducable code is here: https://gist.github.com/israelaece/c0d64a807a2223df56411e08c75ce372