It is great to have Source Currency Amounts and codes in the GL but the current solution can be VERY misleading.

If using i.e. more than 1 period for allocation with a Deferral Template , then the Source Currency is not allocated in the GL at all.

reproduce: issue a yearly Subscription sales invoice for the upcoming period by using deferral templates.

For LCY the amounts are properly allocated with a deferral template, but the source amount is the original amount repeated 12 times. This makes the source amount field completely useless in some cases (or the deferral template usage)