Hi James
To debug this, you'll need to look at:
(1) defaults for those fields that appear to be changing

(2) rules that affect the values of those fields, if any.


(3) if you checked those both already, check to see if there are any rules on the table/repeating group, such as a copy table rule.
Hope that helps.
Best Regards,
Sigrid
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Sigrid Kok
PSE | Winshuttle NA
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