Foreign Currency -intragroup loans

1- i still coudn’t understand the reasoning behind adjustments of intragroup loans/payables in translated accounts of foreign subsidiary.when we apply closing rate to existing liabilities, arent they itself get updated ?.(calculating exchange difference on loans and adjust them in translated accounts seems to me double count )

2
exchange difference on long or short term intra group
monetary items can not be offset against other intra group balances.( couldnt get impact of this sentence in questions p2)