resolved
issue
An import into a module will ignore all values when time mapping is 'Match names' and line item in target has a time summary of either 'Closing Balance' or 'Opening Balance'.
workaround
Edit the import so that time maps on 'Periods' instead of 'Match names'. Running the import this way will report failures for each time summary level, such as Quarter totals, Half-Year totals, and Total for all periods, though these won't impact the import and the necessary cells will be updated.
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