If YOU were paid the commission, it should not be on the Partnership return.
If the Partnership was paid the commission, the broker should have sent the 1099-MISC to the Partnership, not you.
If you incorrectly received a 1099-MISC for work done by the Partnership, you should report it as income, then enter an equal expense as "Nominee Income", which will result in $0 gain/loss. And as the Nominee, you are probably required to send a 1099-MISC to your Partnership.
