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You need to nest your if statement within the COUNTD. See if the logic below works for you.
IF [Fac Prod Fam Cd]='ACOM' OR [Fac Prod Fam Cd]='SCOM' OR [Fac Prod Fam Cd]='LAP' OR [Fac Prod Fam Cd]='RM' OR [Fac Prod Fam Cd]='SCRD')
AND ([Disc Area Id]='400' OR [Disc Area Id]='450')
AND [Prototype Ind]='N'
AND [Ext Cpy Stat]<>'D'
AND [Ser Pfx]<>'BOE'
THEN [Ser No]
Perfect. And makes complete sense. Thank you for taking the time to help.