Master Child link on subform

livvie

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I have a form (1) that is just a list so it does not need to be updateable so I set recorset type to snapshot. On another tab I have another form (2) and a subform (2a) that shows more details about the record shown on form 1.
The master child relationship between Form 1 and 2 is as follows (on form 2)
Link Child Fields drawingid
Link Master Fields [fsubdraw1].form![drawingid]
The relationship between Form 2 and Form 2a is
Link Child Fields drawingid
Link Master Fields drawingid

When I hit add I get the error 'You entered an expression that has an invalid reference to the property form/report' on this line
Forms!frmdrawings.Form!fsubDrawRev.Form!fsubDrawRevsubform.Form.AllowAdditions = True
If I change the recporset type to updateable snapshot this error is gone and it steps thru the code, opens the new record and then as soon as I try to enter the first piece of data I get the 'You can't assign a value to this object' error. I presume it is trying to update the record on Form 1.

Any ideas?
 
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