Cause
There are two columns in multi-currency accounting for the Amount: "Currency Amount", where amounts in any currency may be entered and "Amount (plus base currency initials)" that is automatically used by the program to carry forward the amounts in base currency and the amounts converted from foreign currencies into the base currency at a specified exchange rate. The error message is caused when a transaction in base currency is resulting in different amounts in the "Currency Amount" and "Amount (plus base currency initials)" columns.
Solution
Delete the amount that doesn't match the base currency in the "Amount (plus base currency initials)" column
Refer to Transactions page.
If the transaction is in the base currency, amounts in the "Currency Amount" and "Amount (plus base currency initials)" must be equal. Refer to Transactions page.