This error can happen when updating a wealth rating and you only include one of the following fields( Target Gift Range or Target Gift Range Score), Both will be in your template in order to save. You can add them using the following steps.
  1. Go to administration
  2. Click Batch
  3. Click Batch entry
  4. Click add 
  5. In the drop-down select constituent model and score update batch
  6.  Click save
  7. Click the customize fields button
  8. Under Available field options, expand system model score
  9. Select Target Gift Range and use the arrow to move it over
  10. Select Target Gift Range Score and use the arrow to move it over and click save. 
  11. Input the needed information into your batch 
  12.  Click save