Not testing but try this.
URLRoot() & "db/" & Dbid() & "?act=API_EditRecord&rid=" & [Record ID#]
& "&_fid_43=1&apptoken=xxxx"
& "&rdr=" & URLEncode(URLRoot() & "db/" & Dbid() & "?a=er&rid=" & [Record ID#])
& URLEncode("&NextURL=" & URLEncode(URLEncode(URLRoot() & "db/" & [_DBID_BENE] & "?a=dr&key=" & [Related Beneficiary])))
The generic syntax is below but because you are redirecting after a manual save, you need to use NextURL
$URLONE
& "&rdr=" & URLEncode($URLTWO)
& URLEncode("&rdr=" & URLEncode($URLTHREE))
------------------------------
Mark Shnier (YQC)
mark.shnier@gmail.com
------------------------------