This item has been identified as an outstanding known issue as of the November 17, 2018 platform release. Please contact Support at firstname.lastname@example.org if you encounter this 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'
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 will not impact the import and the necessary cells will be updated.