Why can’t I I put date on line 31220 or 31230?

You can onlyclaim one or the other: 

As per the CRA:

 Line 31220 – Volunteer firefighters' amount, and
Line 31240 – Search and rescue volunteers' amount

You can claim $3,000 for the volunteer firefighters' amount (VFA) or search and rescue volunteers' amount (SRVA), but not both, if you meet all of the following conditions:

• You were a volunteer firefighter or a search and rescue volunteer during the year.
• You completed at least 200 hours of eligible volunteer firefighting services or eligible search and rescue volunteer services in the year.

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