ERROR ACTIVATING DATASOURCE

HI GURU,

AFTER CHANGING MY DATA TYPE TO THE FOLLOWING FIELDS QUANTITY-QUAN, UNDER UNIT/CURR -UNIT

PRICE-CURR,UNDER UNIT/CURRENCY CURRENCY AND REVENUE -CURR,UNDER UNIT/CURRENCY-CURRENCY

WHEN I FINISHED THE CHANGES AND TRIED TO ACTIVATE I GET THIS ERROR Field MATERIALPRICE ( Position 4 ): Missing currency field / unit field CURRENCY

Message no. RSDS094 SAME ERROR FOR QUANTITY AND REVENUE.CAN SOMEBODY HELP ME PLEASE