It's generally considered a bad idea to completely remove an existing fairway just so you can redraw it from scratch. This erases the history of the object and makes it difficult to compare changes to the objects, especially when they are done across saves. But more importantly, you are currently breaking relations that are set up between the fairway and the green and you're leaving a broken multipolygon relation on just the green. You need to make sure you preserve/recreate that relation if you are going to continue to delete fairways. Once again, ideally you would simply modify the existing fairway boundary instead of deleting it. See http://wiki.openstreetmap.org/wiki/Relation:multipolygon if you need help understanding multipolygons. If you need any help, please reach out. Thanks.