Sometimes for an activity, your payment and invoice occur in different financial years. This means you get an error when you try to accept the activity.
For example, a company had an electricity expense that was created in March (FY 2025) FY but was paid and the attachment says April (FY 2026). This would create an error in the system when trying to accept the activity created by Emission Compass.
To fix this, manually edit the activity using the grey pencil icon and change the date to the relevant financial year. Now you should be able to accept the activity!