Hi, I try to customize openerp to my business.

The concept example:
I need object to store info about my projects-works.
So I make an object named x_project and all the related fields.

In addion I need an object task to store task info.
So I make an object named x_task and all the related fields.

But any task related to some project.
So I make a field (x_project_of_task) to object x_task to relate the task to project. I use many2one field type and the appropriate object (x_project) to relation objet. So all work OK.

That I need is to view-access all the tasks of one project from the project view-form. I try some cases but I have problem. I use many2manh relationship but with this method I need to choose task from the project view, not automatically view the tasks of the certain project.

Some help on this?

if a task is only related to one project then you should be using

one2many in project class and many2one in task class.

Thanks for your answer.
OK a task is only related to one project so I am using one2many in project class and many2one in task class. Then I add the field to project view to present the task list of project and when I edit or create a new project, a warning raised as below:
---
Warning
Traceback (most recent call last): File "netsvc.pyo", line 489, in dispatch File "service\web_services.pyo", line 599, in dispatch File "osv\osv.pyo", line 122, in wrapper File "osv\osv.pyo", line 176, in execute File "osv\osv.pyo", line 167, in execute_cr File "osv\orm.pyo", line 2940, in read File "osv\orm.pyo", line 3060, in _read_flat File "osv\fields.pyo", line 474, in get TypeError: coercing to Unicode: need string or buffer, list found
---
So I can't check I I make something whong. Maybe because when I remove the field from view all are OK.

Please some help to solve my prob.
Thanks.

At a geuss you haven't reinstalled your module. Or you are pointing your relations to the wrong place. Basically the error means that some field in your view is expecting a string, but is receiving a list. One2many relations are in essence lists. But your module wants a string.

I hve not install any custom module. I just create my objects from admin panel, then I edit them and I create fiels for any object. I sthat method wrong? The only right method is to create new custom module?

Sorry I don't know, most people don't try to create anything involving relations from admin interface and prefer custom modules.

OK I try something like http://openerp.tv/display.php?rnd=NDk=
and it seems to works.
I will try to create a new module. Thanks.

OK I try to develop a module from start, with its class, view etc and all is ok.
Thanks for help.