Cant add part number to component

Yesterday I could not add parts to a Harness BoM. This morning I tried it again and it worked fine.

Now I can't add a part number to a component on a drawing. I find and select it but it doesn't appear in the next window.

Could this have anything to do with the number of users in one project at a time? Including me there are 5. I do have the drawing open (not previewing)

SolidworksElectrical