Are you translating a banking system??? The banks will recharge postage for the mailing of account statements (preferred by some companies, people without easy access to a statement printer, or if somebody does not collect statements from the printer himself for a certain period of time, the printout is forced and mailed to the account holder). The other postage charges could relate to documents the account holder asks the bank to draw up and mail to him.

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Note added at 1 hr (2009-07-16 23:03:17 GMT)
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Forgot the note for this entry: I was heavily involved in the localisation of one of our core banking systems, and these could be entries from our language files...

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Note added at 11 hrs (2009-07-17 08:21:43 GMT)
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Marion, the account chart will lay out all internal accounts of a bank or company. In a banking system that would be defined in the system with internal account numbers plus posting logic (where to stick it in the P&L, e.g. back due or default interest will be posted as a loss while received interest goes into earnings), for a company accounting system I am assuming they would allocate cost codes and basically do the same.