When you enter foreign currency in journal lines, Navision will automatically calculate and fill in the Amount (LCY) field with local currency. Hence, there may have the situation where the foreign currency is balanced but the local currency is not balanced due to the rounding difference. The journal lines still cannot be posted if the Amount (LCY) is not balanced, even for 1 cent different.
To make the Amount (LCY) balance, you can use Insert Conv. LCY Rndg. Lines to createa another line to balance out the difference. Click FUNCTIONS --> INSERT CONV. LCY RNDG. LINES.
Please take note that before you can use the Insert Conv. LCY Rndg. Lines function, you must define the G/L Account that Navision will post the rounding difference to. To define this account, click FINANCIAL MANAGEMENT --> GENERAL LEDGER --> PERIODIC ACTIVITIES --> CURRENCY --> CURRENCIES to open up the Currencies window. Enter the G/L Account number at the Conv. LCY Rndg. Debit Acc. and Conv. LCY Rndg. Credit Acc. fields.