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    <p>Different order should return equal result in your example. </p> <p>Nevertheless I tested your code (using corrections I made in the question's codes) but can't generate the error you describe. Maybe you had introduced other errors and missed when simplified the code, could you post the sample data you used? (see my data below).</p> <p>First your sample code is buggy I had edited your question to suggest following corrections to fix problems, simplify and improve it for tests, but I don't see the changes updated so I repeat here:</p> <p><strong>Correction 1:</strong> Model changes in a diff format:</p> <pre><code>3,4c6,10 &lt; s_attr = models.ManyToMany(S, through='DRelatedToS') &lt; d_to_p = models.ForeignKey(P) --- &gt; s_attr = models.ManyToManyField('S', through='DRelatedToS') &gt; d_to_p = models.ForeignKey('P') &gt; &gt; def __unicode__(self): &gt; return 'D:(%s,%s,%s)' % (self.id, self.one_attr, self.d_to_p.the_last_attr) 8,9c14 &lt; other_attr = models.BooleanField() &lt; s_to_p = models.ForeignKey(P) --- &gt; s_to_p = models.ForeignKey('P') 13d17 &lt; to_p = models.ForeignKey(P) 15c19 &lt; date = models.DateField() --- &gt; to_s = models.ForeignKey(S) 19a24 &gt; </code></pre> <p>So after apply corrections models look like this:</p> <pre><code>class D(models.Model): one_attr = models.BooleanField() s_attr = models.ManyToManyField('S', through='DRelatedToS') d_to_p = models.ForeignKey('P') def __unicode__(self): return 'D:(%s,%s,%s)' % (self.id, self.one_attr, self.d_to_p.the_last_attr) class S(models.Model): s_to_p = models.ForeignKey('P') class DRelatedToS(models.Model): to_d = models.ForeignKey(D) to_s = models.ForeignKey(S) class P(models.Model): the_last_attr = models.PositiveIntegerField() </code></pre> <p><strong>Correction 2:</strong> Your lookup fields in queries are wrong (<em>Fixed in answer</em>).</p> <p><strong>Following is what I did:</strong></p> <ol> <li><p>Create project and app named <code>testso</code>: </p> <pre><code>django-admin.py startproject marianobianchi cd marianobianchi python manage.py startapp testso </code></pre></li> <li><p>Add your models &amp; adjust project settings (database settings, add <code>testso</code> to <code>INSTALLED_APPS</code>)</p></li> <li><p>Add sample data:</p> <pre><code>mkdir testso/fixtures cat &gt; testso/fixtures/initial_data.json [ {"pk": 1, "model": "testso.d", "fields": {"one_attr": true, "d_to_p": 3}}, {"pk": 2, "model": "testso.d", "fields": {"one_attr": true, "d_to_p": 4}}, {"pk": 3, "model": "testso.d", "fields": {"one_attr": false, "d_to_p": 5}}, {"pk": 4, "model": "testso.d", "fields": {"one_attr": false, "d_to_p": 5}}, {"pk": 1, "model": "testso.s", "fields": {"s_to_p": 1}}, {"pk": 2, "model": "testso.s", "fields": {"s_to_p": 2}}, {"pk": 3, "model": "testso.s", "fields": {"s_to_p": 3}}, {"pk": 1, "model": "testso.drelatedtos", "fields": {"to_d": 2, "to_s": 1}}, {"pk": 2, "model": "testso.drelatedtos", "fields": {"to_d": 1, "to_s": 2}}, {"pk": 3, "model": "testso.drelatedtos", "fields": {"to_d": 1, "to_s": 3}}, {"pk": 1, "model": "testso.p", "fields": {"the_last_attr": 5}}, {"pk": 2, "model": "testso.p", "fields": {"the_last_attr": 5}}, {"pk": 3, "model": "testso.p", "fields": {"the_last_attr": 3}}, {"pk": 4, "model": "testso.p", "fields": {"the_last_attr": 4}}, {"pk": 5, "model": "testso.p", "fields": {"the_last_attr": 10}} ] </code></pre></li> <li><p><code>python manage.py syncdb</code></p></li> <li><code>python manage.py shell</code></li> <li><p>In the shell:</p> <pre><code>&gt;&gt;&gt; from testso.models import * &gt;&gt;&gt; from django.db.models import Q &gt;&gt;&gt; D.objects.filter(Q(one_attr=True, s_attr__s_to_p__the_last_attr=5) | Q(one_attr=False, d_to_p__the_last_attr=10)) [&lt;D: D:(1,True,3)&gt;, &lt;D: D:(2,True,4)&gt;, &lt;D: D:(3,False,10)&gt;, &lt;D: D:(4,False,10)&gt;] &gt;&gt;&gt; D.objects.filter(Q(one_attr=False, d_to_p__the_last_attr=10) | Q(one_attr=True, s_attr__s_to_p__the_last_attr=5)) [&lt;D: D:(1,True,3)&gt;, &lt;D: D:(2,True,4)&gt;, &lt;D: D:(3,False,10)&gt;, &lt;D: D:(4,False,10)&gt;] </code></pre></li> </ol> <p>Same result! ...as expected.</p>
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    1. COThanks for your answer! I will try this later to see if it works. About your corrections, i edited my question to fix my bugs, but some of them weren't bugs (like 'P' instead of P)... If you want edit your answer so as to make it shorter. I wanted to accept your edit but i think i don't have the reputation needed...
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    2. COReferencing a Model that you don't has defined before raises an exception, so that's why you need 'P' insted of P ...I will propose corrections again, I think you don't need reputation to accept this proposal ;)
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    3. COproposal changes done, after I see your question updated I will delete from my answer
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