Referencing parent field using getdocfield in new responce docs.

Hi I'm trying to reference a field of a parent from a new responce doc.  I'm using a @getdocfield but I keep getting an error message "invalid unid, unid must be 32 characters long."  I know the $Ref field doesn't get populated until you save so I tried putting
@If(@IsNewDoc;@Command([FileSave]);"")in the postopen event but that didn't help solve the problem.  What am I doing wrong?
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Use Form Property, "Formulas Inherit values from selected document". And setup the default value for the field in the response to have the fieldname of the parentdoc.

Good Luck

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