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Hi
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I have a multi page form with 4 pages - the last one is confirmation page used to print data entered / selected on page 1-3.
Page 3 contains the following checkbox:
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On the confirmation page (page 4) I put the following to print the selected checkbox values:
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<tr><td><strong>Member of trade associations: </strong></td><td>{data.join[, ]:select_trade_associations}</td></tr>

This generally seems to work but I also have "Back" buttons on all pages.
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1) When new session starts and you get to page 4 with confirmation the selected values are printed correctly e.g. 'ACS' checked prints:
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Member of trade associations: ACS
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2) When you press back and change the checkbox values it seems to work fine:
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Member of trade associations: ACS, NFRN, SGF, RetailNI, Other/None
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3) When you use the Back button again the problems start e.g. when only 'ACS' and 'Other/None' are checked I get the following values printed:
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Member of trade associations: ACS, Other/None, SGF, RetailNI, Other/None
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4) Now when I press Back and select only 'Other/None' I get the following print-out on the next page (confirmation):
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Member of trade associations: Other/None, Other/None, SGF, RetailNI, Other/None
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Something is obviously not right - the printed values are incorrect e.g. 'Other/None' is printed multiple times instead of just one in case no 4 and in case no 3 'ACS, Other/None' should be printed but I get 'ACS, Other/None, SGF, RetailNI, Other/None'.
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How do I solve this?

I think this happens because more sessions are added when the "Back" buttons are used and the field array gets messed up.
So far I have added to the first page:
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But this doesn't solve the issues as I still get incorrect values when Back buttons are used.

Another update: I have read https://www.chronoengine.com/forums/posts/t105813/multi-page-form-with-back-button-not-saving-data-in-session?keywords=multi%20page%20array%20back and it looks like I need to use "Event switcher" on each page and "Display Form" actions on each page but I can't seem to find "Display Form" on the list of available actions in my version of CF6 or I'm completely confused here...

There's a Form Area you can use in the views.