double negative in the essential exception

Name: Alex Li
Email: alex.li@sap.com
Affiliation: SAP
Document: W2
Item Number: Success Criterion 2.2.1
Part of Item: 
Comment Type: editorial
Summary of Issue: double negative in the essential exception
Comment (Including rationale for any proposed change):
\"the time limit cannot be extended without invalidating the activity\" is a double negative statement.  This is confusing.

Proposed Change:
Time extension would result in invalidation  of the activity. In which case, no time extension is required.