Why does the error Invalid Update comes when I try to change one field value?

[Mouktik_B]

There is an UI policy in the RITM that when i check a field/box, it gives me the dates to fill in.

now when I save it , it reflects in the SCTASK which is great . 
When I come back in the RITM and uncheck the box and save , it givces me the error - INVALID Update ....

Tried using client script and Ui policy , nothing works. 
the error still there ..
Please help..

[Sandeep Rajput]

@Mouktik_B Please check if you have any business rule working on your table which sets current.setAbortAction(true); when ever the box is unchecked or the date field's value is cleared and changes are saved.

[Donahue]

Thanks @Sandeep Rajput! I just ran into the same problem in a learning instance and this helped identify the cause right away.

[Sandeep Rajput]

Glad to know it helped.

[vDev]

Check the dictionary for any fields on that table which has "Unique" checkbox ticked apart from OOB fields.