passing an argument for the parent and for the child you want is how it works. that one it only retrieves 1 child and the association needs to be 1 to 1 if you want to bind to specific fields if you do it 1 to many then yes you cant and will have to use a table.
workflowuser Unfortunaly my form does not need to show all the other children of the parent at once. it only needs to show one of them and not in a table but on respective fields so that they can be changed.
this is then a limitation of AEM if I am understanding correctly.
workflowuser let me understand this.... what I am trying to do is not possible? is AEM forms supposed to work only with one table? and if it has any one to many relationships? the children of the parent object can only be shown on a GRID?