Create Survey
goto CPD
search for CPD entry
Tick select box next to CPD entry
Click Add to survey
Select survey
Remove checkmark against 'Display Survey Tokens after adding?'
Click 'Next'
Click continue on attribute mapping screen
Goto Survey
activate survey (switch to closed access mode)
Deactivate survey
Create new token table (TOkens --> Initialise tokens)
goto CPD
search for same CPD entry
Tick select box next to CPD entry
Click Add to survey
Select survey
Remove checkmark against 'Display Survey Tokens after adding?'
Click 'Next'
Click continue on attribute mapping screen
Goto Survey
Delete Token table

Error returned:

<h1>CDbException</h1>
<p>CDbCommand failed to execute the SQL statement: SQLSTATE[23000]: [Microsoft][SQL Server Native Client 11.0][SQL Server]Violation of PRIMARY KEY constraint 'PK__survey_l__242D72FDE35AC69C'. Cannot insert duplicate key in object 'dbo.survey_links'. The duplicate key value is (6d4553a4-a2f0-49f4-83c3-30619a8fda5b, 2, 816272).. The SQL statement executed was: INSERT INTO [survey_links] ([participant_id], [token_id], [survey_id], [date_created]) VALUES (:participant_id, :token_id, :survey_id, :date_created) (C:\limesurvey\framework\db\CDbCommand.php:354)</p><pre>#0 C:\limesurvey\framework\db\CDbCommand.php(1178): CDbCommand->execute(Array)
#1 C:\limesurvey\application\models\Participants.php(1081): CDbCommand->insert('{{survey_links}...', Array)
#2 C:\limesurvey\application\controllers\admin\participantsaction.php(1540): Participants->copytosurveyatt('816272', '', Array, '6d4553a4-a2f0-4...', 'false', 'false', 'false', 'false')
#3 [internal function]: participantsaction->addToTokenattmap()
#4 C:\limesurvey\framework\web\actions\CAction.php(107): ReflectionMethod->invokeArgs(Object(participantsaction), Array)
#5 C:\limesurvey\application\core\Survey_Common_Action.php(100): CAction->runWithParamsInternal(Object(participantsaction), Object(ReflectionMethod), Array)
#6 C:\limesurvey\application\controllers\admin\participantsaction.php(51): Survey_Common_Action->runWithParams(Array)
#7 C:\limesurvey\framework\web\CController.php(309): participantsaction->runWithParams(Array)
#8 C:\limesurvey\framework\web\CController.php(287): CController->runAction(Object(participantsaction))
#9 C:\limesurvey\framework\web\CController.php(266): CController->runActionWithFilters(Object(participantsaction), Array)
#10 C:\limesurvey\application\controllers\AdminController.php(169): CController->run('participants')
#11 C:\limesurvey\framework\web\CWebApplication.php(276): AdminController->run('participants')
#12 C:\limesurvey\framework\web\CWebApplication.php(135): CWebApplication->runController('admin/participa...')
#13 C:\limesurvey\framework\base\CApplication.php(162): CWebApplication->processRequest()
#14 C:\limesurvey\index.php(178): CApplication->run()
#15 {main}</pre>