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could you post some examples/screenshost how exactly do you do this handshaking, how does your links/redirects looks like and how does your overall design look like?
I'm a bit confused from some of your statements...
eg. "using a redirect URL in the button settings and Source=<mysite url>" - you should use one or the other. I'm sure how would it would it you provided different links for both. I'd say redirect url overrule source parameter.
The following pic describes what we are attempting to do. The issue is that based on the the arrangement of the text inserted in the Nintex form button settings Redirect URL, either the "Source=" works (returns to the parent form after saving the child new item), or the ParentID parameters are passed to the proper fields in the New Item Form (NewForm.aspx) of the child list. Which ever value comes after the "?" in the redirect URL string appears to work correctly, the second entry is ignored.
Perhaps I should just use a label w/ a hyperlink rather than a button and the Redirect URL entry (I found that technique on these forums as part of establishing the parent/child relationship).
This post solved my problem Add variable to URL on Nintex Form (Thank you Marian!)
I added a Calculated control, built the dynamic formula using that post as model to include both my parameter setting and source to return to the parent item. I set the control to recalculate on display. Works like a charm.
have you seen GetQueryString() inline function?
you can use it to set control's default values.
Or, is there a way to convert the Single Line Text to an ID variable that then populates the Lookup Field?