I got error in costing manager as below , EBS 12.1.3

I got error in costing manager as below :

CSTPLCIN.COST_INV_TXN:No conversion rate has been defined for the combination of foreign currency and conversion rate type used in this transaction, or the defined conversion rate is not valid on the date of this transaction.

I defined the corporate conversion rates, used the hereunder update statement and run the costing manager again but still the error exist:

Update mtl_material_transactions
             Set costed_flag = 'N',
             transaction_group_id = null,
             error_code = null,
             error_explanation = null,
             currency_conversion_rate = 50.28,
             CURRENCY_CONVERSION_TYPE = 'Corporate'
             where transaction_id = Trx_id;