I am generating notes that reference items numbers in a large assembly. Some of the item numbers do not appear in the note after I select the balloon. It just seems to add a empty space.

I am generating notes that reference items numbers in a large assembly. Some of the item numbers do not appear in the note after I select the balloon. It just seems to add a empty space. I have gone to the assembly and either deleted the part and reassembled it or added an additional one, then re-ballooned it in the drawing- which sometimes works but neither technique is practical. Any suggestions?