Expenses accounting

I am working on the PS 9.1 Expenses module and am running into an issue with the accounting.  The 'Post Liabilities' process is correctly debiting the expense account and crediting the liability account.  The subsequently created journal displays this information, including the department ID (cost center) from the expense line's distributions.

When Publish to Payroll is run and the information returned (updating EX_SHEET_PYMNT statuses to "Paid"), we run Post Payments to generate a journal from this data.  Post Payments writes to EX_ACCTG_LINE with the expense account credits and liability debits but lacks the department IDs.  This resutls in concern.  Has anyone else encountered this issue?  The attachment shows an example of the accounting entries created by both processes, in case the above is unclear.