Since SAP doesn't provide specific tcode for display only exchange rate, it can be managed by handle the authorization from PFCG.
Here's how:
| 1. Open t-code PFCG > edit the desired Role | 
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| 3. Change Authorization Data |  |
| 4. Find object: S_TABU_DIS |  |
| 5. Add Table Authorization Group: FC32, with Activity: 03. If this user need to have access for other table, add this one also: Table Authorization Group: /SPE-FC31 and FC33-Z*, with Activity: * |
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