不检查燮preSS如果复制。。你需要写公式的显示字符串

Do not check Suppress if Duplicated.. You need to write formula for Display String.

例如，

if PreviousIsNull ({object.field}) then 
  cstr({object.field})
else
if CurrentFieldValue=previous({object.field}) then 
   '0.00' 
else 
  cstr({object.field})

编辑：

  if PreviousIsNull ({object.field}) then 
      cstr({object.field})
    else
    if {object.field}=previous({object.field}) then 
       '0.00' 
    else 
      cstr({object.field})