Getting minor warning errors in Schema

I'm getting the following errors from the Schema module, as well as a few others because no default value is specified in the

<li>pay_form_node.pfid is part of the primary key but is not specified to be 'not null'.
<li>pay_form_node.nid is part of the primary key but is not specified to be 'not null'.
<li>pay_transaction_node.pxid is part of the primary key but is not specified to be 'not null'.
<li>pay_transaction_node.nid is part of the primary key but is not specified to be 'not null'.

I'll submit a patch file for pay/modules/pay_node/pay_node.install shortly.