"code": "FilingCalendarCannotBeEdited",
	"target": "Unknown",
	"details": [
			"code": "FilingCalendarCannotBeEdited",
			"number": 904,
			"message": "Unable to Edit this filing calendar",
			"description": "There is a current approved worksheet for this filing calendar.  Filing calendars cannot be edited with an approved worksheet associated with it.",
			"faultCode": "Client",
			"helpLink": "",
			"severity": "Error"

Worksheets are generated monthly and approved between the 5th and the 10th. For monthly returns, the worksheet will be approved monthly. Quarterly returns’ worksheets will stay in a pending approval state until the quarter expires.

Once the worksheet approval occurs, the filing calander cannot be edited or adjusted. For more information about filing calendar actions, take a look at your options for unlocking approved returns.