Entity field is read only in bulk edit in mscrm 4.0

We all are very much handy using the bulk edit feature in MSCRM 4.0 to bulk update data. We might come across some scenario where we tried to update a field during bulk edit and found that field is set as read only even though the field is not read only field. 
The reason for this is there is an OnChange script published for that field letting not the users to bulk edit that field. For time being, you can uncheck the load script button on the onchange event and publish the entity and you can now able to edit the field.