Standard Table maintenance Restrict Columns

I have small requirement, I try to Complete it, Have not got any solutin.
there is is Standard tcode:OB08 Currency Exchange rates,
here two columns are enabled mode. So users can able to enter amounts and able to save it,.

Here i want to restrict to some users, they has to see the table,They should not able to save it. I tried to Disable the Save button. But thinking this is not a solution.
Could any body tell me is there any solutions for this.