If you are getting error "A currency to convert from is required to retrieve exchange rate information" on posting statement in Retail then following suggestion can be your solution.
It can be resolve you need to check tables-RetailTransactionSalesTrans -currency may be missing in table-RetailTransactionSalesTrans from the currency column .
It can be resolve you need to check tables-RetailTransactionSalesTrans -currency may be missing in table-RetailTransactionSalesTrans from the currency column .