civicrm/civicrm-core — pull request #2181 by davecivicrm (2013-12-10 01:31:27+00:00)
Title: CRM-13919 - Improved form rule to handle add mode differently.

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* CRM-13919: Fatal error when user accidentally uses duplicate transaction # while recording a contrib.
http://issues.civicrm.org/jira/browse/CRM-13919