OR... you could do a simple script, first giving the value cerozero (0) then including the formula back and this do the trick:
var cell = sheet.getRange("B1:B1"); //SHEET TO INSERT VALUE
cell.setFormula("=0");
Utilities.sleep(2000); //JUST TO GIVE TIME TO UPDATE (OPTIONAL)
var cell = sheet.getRange("B1:B1");
cell.setFormula("=ImportRange(\"YOUR_SHEET_ID\",\"RANGE_TO_INSERT\")");