New document has nulls Error in Asset Addition in Idempiere 6.2

Am trying to do asst addition in this https://demo.globalqss.com/webui/index.zul
1. I created PO for the asset >800007
2. Received PO >10000515
3. Matched PO with Invoice 10000016
4. Gone to asset addition (doc number 1000000) to complete addition i get error "New document has nulls"
5. I have checked all looks good. It appears to be a bug