🚀 go-pugleaf

I have a databound listbox. It gets its data from a dataview with a 
rowfilter. There's a button that adds entries to the listbox, which is 
working fine. There's another button that's supposed to remove entries 
from the listbox, however, it doesn't work as it's supposed to. I can 
remove exactly one entry but on the second one it tries to delete the 
same record from the database again, which obviously isn't present any 
more. Here's what I do:

     strID := libDocuments.SelectedValue.ToString; //libDocuments is the 
listbox
     messagebox.Show(strID); //this is how I know it tries to delete the 
wrong entry
     libDocuments.DataBindings.Clear;
     dv_doc.AllowDelete := True; //the dataview
     bm_doc.RemoveAt(libDocuments.SelectedIndex); //binding manager base
     db.write_changes(da_doc, ds, false, 'Dokumente'); //this is 
basically a sqldataadapter.update just with some associated logging but 
I've alternatively also tried it with an explicit SQL delete statement 
as follows:
//    sc := sqlcommand.Create('delete from tbl_Documents where 
fld_documentID = '
//      + strID);
//    da_doc.DeleteCommand := sc;
//    db.write_changes_del(da_doc, ds, true, 'Dokumente', sc);
     dv_doc.AllowDelete := False;
     SetLookupBinding(libDocuments, 'fld_documentAddress', 	 
'fld_documentID',
       'fld_documentID', dv_doc, dv_doc);

Where am I going wrong?

TIA.

Brigitte