I cannot seen to make this work today. I have used this but....
I need to update a field in the parent and the lotus script code is located in the Postsave of the child
Dim parentcomposed As String
Dim composed As String
parentcomposed = parentdoc.FieldGetText(fld_ECN_seqnum)
composed = source.FieldGetText( "RFC_seqnum")
If composed <> "" Then
parentcomposed = parentdoc.FieldSetText(fld_ECN_seqnum) --- This part does not work