Im a french new user of strataframe, so excuse my language fault.

My problem.

I have a form with to businessobject.

The first is  ActeursBO

 It contain a table "acteurs" with  identifiant    int     identity and primary key

                                                 name        char(30)

                                                 firstname   char(10)

                                                 titre_id     int

The  data are

    IDENTIFIANT                     NAME                     FIRSTNAME                 TITRE_ID

                   1                        LEISSLER                ERIC                             3

                   2                        LEISSLER                COLETTE                        2

                   3                        LEISSLER                SEREINE                        1

THE second businnes object is

TITREBO

It contain  table   "titre" with   identifiant   int  identity   primarykey

                                             abrege            char(10)

                                             libelle             char(30)

and the data is

IDENTIFIANT               ABREGE                  LIBELLE

        1                          Melle                      Mademoiselle

        2                           Mme                      Madame

        3                           M.                          Monsieur

So in my form i have  acteursBO1  and  TitresBO1

in the property of titresbo1 i have  ParentbusinnesObject  = ActeursBo1

So i drop a  strataframe combobox in my form

on property  i go to Businnesobject and i select Acteursbo1

In bindingfields i select titre_id

in the property Plulatiopndatasourcesettings  i select in busines obect type titresbo

in display member i select abrege and in value number i select identifiant

When i execute i have an error  at the line

ctype(component,acteursbo).titre_id = ctupe(value,system.int32)

the error is the conversion of type  dbnull  in type integer is not valid

What can i do ?

what i have not do ?

what i have to do  ?

i don't find in the example à simple exemple with a simple combobox.

Somebody  can  send an  sample example like this problem ?

I will thank you for the time  you pass'd to read this post

Best regard

Eric LEISSLER