Ok Spoke to soon. This didn't work.
After adding it my applicationID was still 0
I looked at my table in MySQL DB and confirmed that my applicationID column was a primary key and that it had Auto Increment ticked. So I looked at the reversemapping.config and found that this
column name="ApplicationID" isPk="True" isAutoInc="False" adoType="4" sqlType="INTEGER" length="0" isNull="False" />
I went back into the reverse wizard to see if this option is available there but found nothing, So no way to check if it gets it wrong without looking at the config file. So is this a bug with Open access and Mysql? Also could we have a tick box for this next to the primary key one.
I will try and edit the reversemapping.config manualy and set isAutoInc="True" to see if this makes it work.