Look at GLT0 definition, you have a column for "Balance carried forward" and one for "Total transactions of the period" (16 periods max) for til to 3 currency codes. Note you have also a record for debit and one for credit, and records can be multiplied by Business Area or other Customizing dependant criteria.
NB: You should also talk to "headquarter" of "Businessl Content" provided with BW...
Regards,
Raymond