Below script will help to find the column reference in sql server.
Select SysObjects.[Name] As [Contraint Name] ,Tab.[Name] as [Table Name],Col.[Name] As [Column Name],*
From SysObjects Inner Join (Select [Name],[ID] From SysObjects Where XType = 'U') As Tab
On Tab.[ID] = Sysobjects.[Parent_Obj]
inner Join sysconstraints On sysconstraints.Constid = Sysobjects.[ID]
where Col.name='UserID' --Column Name
order by Tab.[Name]