What should someone without SSN or ITIN put in under social security number?

My friend is trying to create a federal tax return on TT but the system will not allow him to put in a dummy 000-00-000 social security number or even leave it blank.  He want's to paper file it with W-7 form so that he could get an ITIN. Is it okay if he puts 000-00-001 for SSN or what else can he do? Thanks!