Q1: Transaction FAGL_FC_VAL (foreign currency revaluation) has tab "Open items" and tab "G/L balances". What is the difference?
A: Open items tab is for revaluation of vendors, cutomers and GL accounts managed with open items...
The rest - in the free e-book FREQUENTLY ASKED QUESTIONS ON SAP FINANCE.
Q2: I configured revaluation for KDF transaction, assigning GL account to be used for revaluation purposes. But I still have problems with account determination in FAGL_FC_VAL (foreign currency revaluation). What have I done wrong?