Nested API Button open form to add input, check box and redirect back to original form

I have another API Button question...similar to my last question.   Using the same table set up (below), but this time the button would be selected if it's for a license that would not be applicable and input from the User would be required.   I created a simple table that would pop up when the button was pushed asking the User to add information into the field. It would also check the [Not Applicable] button, then refresh back to the original page.   However, I get the attached error page.   Any thoughts?  

License Master (parent table)

Pending Locations (parent table

Suggested Licenses (a child (many to many table) to both above)

Licenses (child (many to many table) to both License Master and Pending Locations / unrelated to Suggested Licenses)

var text UpdateSuggestedLicense=URLRoot() & "db/" & [_DBID_SUGGESTED_LICENSES]
& "?act=API_EditRecord"
& "&rid=" & URLEncode([Record ID#])
& "&_fid_18=true" //Check Not Applicable to this Location
& "&apptoken=MY TOKEN"
& "&rdr=" & URLEncode(URLRoot() & "db/" & Dbid()
& "?a=dr&rid=" & [Record ID#]); 

var text OPEN="<a class=\"OpenAsPopup\" data-height=900 data-width=900 href='" 
    & Dbid()
    & "?a=API_EditRecord&rid=" & [Record ID#] // Suggested License ID
    & "&dfid=11" // Not Applicable form ID
    & "&apptoken=MY TOKEN";

var text RefreshPage = URLRoot() & "db/" & Dbid() & "?a=doredirect&z=" & Rurl();//refresh and redirect back to License page

$OPEN
&"&rdr=" & URLEncode($UpdateSuggestedLicense)
& URLEncode("&rdr=" & URLEncode($RefreshPage))