Ex.rate diff.accts are incomplete for account & currency &

What causes this issue?

The accounts for posting exchange rate differences could not be
determined. For the specified G/L account and the specified currency
key, the accounts are only specified incompletely. Either the accounts
for the implemented exchange rate difference, the accounts for the
valuation differences or the balance sheet adjustment account are
missing.

System Response

The system cannot generate the exchange rate difference posting.

How to fix this error?

By pressing ENTER, you achieve that the document is reset to a status
without automatic posting. In another window, you can complete default
settings for exchange rate differences and post the document afterwards.
IF &DEVICE& = 'SCREEN'
<DS:TRAN.OBA1>Proceed</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.