Creating Relationship in PowerPivot error

[harihar]

Hi,

I am trying to create relationship between Actual & Budget tables but get following error:

============================
Error Message:
============================
The relationship cannot be created because each column contains duplicate values. Select at least one column that contains only unique values.
============================
Call Stack:
============================
at Microsoft.AnalysisServices.Modeler.Controls.RelationshipController.formCreateRelationshipDialog_Confirming(Object sender, EventArgs e)
at Microsoft.AnalysisServices.Modeler.Controls.CreateRelationshipDialog.buttonOK_Click(Object sender, EventArgs e)
============================

Please help me in this matter.

Thank you,

Chirag