Hierarchial Extension and Find Form

Hi,

I want to display my custom BO in an OWL, using a Hierarchial Extension and a Find Form.

The source of my custom BO looks as follows (only the elementary fields are specified here):

businessobject ITCOBSGroup

{

  [AlternativeKey]

  element ITCOBSGroupID : ID;

  element ITCOBSGroupParentID : ID;

  element HasChildIndicator : Indicator;

  association ToChildEntry [0,n]  to ITCOBSGroup valuation (ITCOBSGroupParentID == ITCOBSGroupID);

  element ITCOBSGroupName : LANGUAGEINDEPENDENT_EXTENDED_Name;

}

In order to use a find form I created a custom query. In the next step I bound the query fields to my data model. And here is my problem:

Unlike the standard query my custom query yields not an association "ToChildEntry" that I could bind to the corresponding element ("ChildrenAssociation")of the Hierarchial Extension.

So I wonder how it is possible to use the Find Form and a Hierarchial Extension in the context of on OWL.

Thanks for your help and your answer in advance.

Markus