How To Fix UO123 - Ratios for the inverse euro exch.rate are missing for partic.currcy &1

SAP Error Message - Details

• Message type: E = Error

• Message class: UO - Maintain Currency Tables TCUR* for Euro Introduction

• Message number: 123

• Message text: Ratios for the inverse euro exch.rate are missing for partic.currcy &1

What causes this issue?

You have made euro settings in the currency tables in your system, but
have not entered the ratios for the participating currency <-> euro
exchange rates for every participating currency.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Maintain the missing ratios under standard view maintenance.

Error message extract from SAP system. Copyright SAP SE.