In the described examples a given graphical user interface (GUI) instance of a set of GUI instances for a given transaction with an external system is provided. The given GUI instance of the given transaction comprises a set of data fields for completing the given transaction. The set of data fields exposed in the given GUI instance are dependent on execution of an operation in another GUI instance in the set of GUI instances for the given transaction, wherein the given GUI instance of the transaction receives a given data set for the set of data fields. The given data set characterizes user input for the given GUI instance of the given transaction, and the given data set and the given GUI instance of the given transaction correspond to a given state of the given transaction. A transaction state logger tracks the given transaction.