The purpose is to not have 000.00 for the ck book balance if a transaction date is no entered
-1- A formula result cannot be exactly blank. If nothing is shown the reult may be
-1.1- empty or whitespace text. (This, however, not with your arithmetic expressions.)
-1-2- zero in a document for which suppression of zero results was set (Not recommended!)
-1-3- anything in a cell for which an extremely lying ‘Numbers’ format is set.
-2- If 000.00 is shown for a zero result there must be set a non-default cell style or ‘Numebers’ format for the cell.
-2-1- Common default cell style Using ‘General’ format for numbers would display 0 (except with case -1-2-).
-2-2- A different setting should be intentionally applied. “Who did?” is then the question.