Received a 1098-T for my husband who receives Veterans' Educational Benefits through Vocational Rehabilitation, line 5 does not list an amount.

In the deductions section there is a section to include the amount received for Veterans' Educational Benefits.  I'm unsure of what amount to put in.  Box 1 has the amount $6,185.00.  

He received monthly benefits but it depended upon his days enrolled in University- I looked and we had random amounts deposited with the maximum amount being 2600.

I left the box blank and it's giving us the American Opportunity Credit... double dipping?