'maxlength' => 3,
'size' => CRM_Utils_Type::FOUR,
'where' => 'civicrm_pledge_payment.currency',
- 'default' => 'NULL',
+ 'default' => NULL,
'table_name' => 'civicrm_pledge_payment',
'entity' => 'PledgePayment',
'bao' => 'CRM_Pledge_BAO_PledgePayment',