Service items Currency price is not editable in Purchase requisition form

Hi,

User has created a Purchase requisition with line type as Goods and second line with service, in currency tab based on the conversion rate type currency price calculated, but the value is not correct due to the rounding off to 5 decimal, user requested to have the exact value in currency price, suggested to edit the currency price to more than 5 decimal then the total amount has matched with the value which user requested, this is possible only when the line type is Goods, failed to edit the price incase the line type is services.

Can anyone suggest is there any option to edit price for line type Services, also is there any option to increase the rounding off decimals more than 5 in purchasing requisitions.