Solution : https://service.sap.com/sap/support/notes/1273626 (SAP Service marketplace login required)
Key words :
exchange rate differences greater, document exchange rate, exchange rate difference, document line items, local currency amount, enter tax manually, manually enter, local currency, tax manually, rounding difference
Related Notes :
| 1243787 | FB01 - Local curr amount enterd manually is calculated again |
| 1141955 | FB01 should also create exchg rte diff lines w/o tax rate |