How would you ask "did I leave anything out?" in Italian? Like, if I made a list of things and I want to know if I did not include something that I was supposed to. I am thinking "non messo qualcosa?" ma non lo so.
Commonly you will hear a more active form of the expression with the verb "dimenticare"
Ho dimenticato qualcosa?
Dimentico qualcosa?
A more sophisticated (and somewhat quaint/formal) expression that is similar to what you have suggested uses the verb "omettere" (to omit).
Ho omesso qualcosa dalla/nella lista?
As Denis suggested, watch out with the pronunciation between "ho" and "omesso".
As DaG suggested, something similar to what you had in mind which I had not thought about is
C'รจ qualcosa che non ho messo/incluso?
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3I wouldn't recommend using the verb omettere: it's quite formal and easy to mishear as mettere (with exactly the opposite meaning!), especially after a word ending in -o. – Denis Nardin♦ Feb 7 '19 at 8:58
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3Granted, it is quite formal, although I personally use it quite a lot, even in everyday contexts. And yes, one must have a mastery with respect to pronunciation to use it in the sentence above. – Easymode44 Feb 7 '19 at 9:05
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1+1 for omettere/omesso, both in itself and because is possibly the word the OP tried to remember. Or perhaps he had in mind something like C'è qualcosa che non ho messo? – DaG Feb 7 '19 at 11:20
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@Dag good point, didn't think about it! I will edit the answer with your comments for the sake of completeness – Easymode44 Feb 7 '19 at 12:16