When working with production orders and advanced warehousing, one creates warehouse work when one releases the production order. But in case of shortage , no materials are available at all, no work is created at all. But the wave is. If I solve my shortage and want to release again, I get an error that there is already a wave for my prod order. I have to delete this prod wave first before proceeding. SUGGESTION: if the release to warehousing does not result in any work, do not create that prod wave either. Seems to have no sense to create this wave and then let it sit in status 'created". I can not pick up this old wave for my next release .Roll back the entire process, in other words.