Hi!

Well, this is quite a complex question. Many programmers solve it by different ways. For example, create garbage collection programs. Or create special classes to track cross-references. Personally, I like the approach on the OOP and design level. Just create a method "Release" for your business object. SOe releasing of it will now require 2 commands:

goBusiness.Release()
release goBusiness

First command will call that method, second will release the variable from memory. In the Release() method put a code to clean up all references that are holded by that object. In your case:

* Business object
procedure Release

this.oData.Release()
this.oData=.null.

endproc

* Data object
procedure Release

this.oBusiness=.null.

endproc

Let objects know well how to cleanup self (in Release method).

HTH.

>Hi again
>
>I understand that you say, but how manage this without a clear all?
>
>This is a business object, and i need to close without clearing others objects