If iLayer and myLayer are subclasses from aLayer, when how can the parent class know about its children? I think it's impossible.

Also, I believe there is a slight problem in the Save or it's a typo:

>IF NOT THIS.BeforeSave()
> RETURN .F.
>ENDIF

>Hi David
>
>>Is there an explicit call to cForm.Save() like you have posted? If so it looks out of place.
>
>No, it is the save method that has calls to BeforeSave() and AfterSave() with it's own working inbetween. But all of this is in the cLayer framework layer which I do not touch. But I have equivalant Save(), BeforeSave() and AfterSave() available in the iLayer, aLayer and MyLayer. As you may well be aware of the old codebook methodology I can modify the iLayer for all my applications use. aLayer and MyLayer are application specific. Now I wanted to catch a failure in aLayer and MyLayer in the iLayer. But all I have been able to be successful is catch the cLayers failures in iLayer due I, my guess the placement of DODEFAULT()s.
>
>This is the untouchable cLayer's cForm.Save()
>

>IF NOT THIS.BeforeSave()
>   RETURN
>ENDIF
>
>*** save stuff here
>
>THIS.AfterSave()
>

>
>This is the framework customization iLayer's iForm.BeforeSave() (as updated by Naomi) and where I am only able to catch the codebook cLayer errors. My intention is to catch MyLayer and aLayer errors here.
>iForm.BeforeSave()
>

LOCAL llRetVal, lcErrorMsg
>
>llRetVal   = DODEFAULT()
>if not m.llRetVal
>lcErrorMsg = THIS.oBizObj.GetErrorMsg()
>
>IF NOT EMPTY(lcErrorMsg)
>	THIS.DisplayErrorMsg(lcErrorMsg)
>ELSE
>	THIS.DisplayErrorMsg("The record has not been saved." + CHR(13) + CHR(10) ;
>			+ "Please provide the required details and try saving again")
>ENDIF
>
>endif
>RETURN llRetVal

>
>
>This is the app specific MyForms.BeforeSave()
>

llRetVal = DODEFAULT()
>llRetVal = llRetVal AND THISFORM.pgf.Page1.txtIno.CheckForBadNextNo()
>
>IF llRetVal
>*** my stuff where somewhere it fails and llRetVal = .F.
>ENDIF
>
>RETURN llRetVal

>
>
>Hope I am able to pass on my intentions clearly.