IIf(ProjDateDiff([Baseline Finish],[Status Date],"Standard")>=0,
100,
IIf(ProjDateDiff([Status Date]+1,[Baseline Start],"Standard")>=0,
	0,
	((ProjDateDiff([Baseline Start]-1,[Status Date],"Standard")/480)
	/(ProjDurValue([Baseline Duration])/480))*100))
	
	
this is used to calculate Baseline % complete when one or more baseline attached in actual scheduling in
microsoft project.