Message TR2701 The columns specified by alternate data source... don't match...

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In cognos HELP for this error : go ...Menu TOOLS/ Check columns. I don't have a mismatch error. But i cannot generate my cube. ---- Error: (TR2701) The columns specified by the alternate data source for PowerCube 'Infocom_alimentation' don't match the columns in data Source 'Infocom_ventes_Statistiques de ventes_Produits'. Do you have a solution ? Thanks