Solution : https://service.sap.com/sap/support/notes/1404156 (SAP Service marketplace login required)
Key words :
system issues error f5 060 'posting, issue error message f5 061, transfer takes place, alternative tax rate, program error, tax calculation, manual tax, simulate documents, foreign currency, local currency
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 |
| 1012927 | Manual tax amount and alternative tax rate |