Define a currency key for currency type &

What causes this issue?

No currency key has been defined for the specified currency type.

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?

Depending on the currency type, define a currency key as follows:
Currency type "11" "12"
The currency key is identical to the key of the local currency. You
cannot and do not have to define other values.
Currency type "30" "31" "32"
You define the currency key for these currency types when you define
the client. You do this by selecting Basic Functions -> Set Up Clients
in the Customizing menu. Here you select the activity "Define Clients".
Currency type "40"
You define the currency key for this currency type when defining the
countries in the "Hard currency" field. You do this by selecting
<LS>General settings -> Set countries -> Define countries</> in the
Implementation Guide (IMG).
Currency type "50"
Define the currency key for this currency type when you define the
countries in the "Index currency" field. Do this by selecting
<LS>General settings -> Set countries -> Define countries</> in the
IMG.
Currency type "60"
You define the currency key for this currency type when you maintain
the companies. Do this by selecting <LS>Financial Accounting ->
Consolidation -> Master Data -> Companies -> Maintain companies</> in
the IMG.

Error message extract from SAP system. Copyright SAP SE.