I know that vLookup does not work with NewForm.aspx, but is there any exception to getting this to work if you are prefilling the field it would use when building the vLookup when creating a new item from EditForm.aspx?
It says if I am using DFFS in the child I don’t have to use the receiver file, but when I go into the vLookup setup for the NewForm.aspx, my field is not listed. Also, when I add the “_” to the fields (EditForm), they don’t show up in vLookup, but when I remove it they do.
When I use the instructions above and go into the NewForm.aspx DFFS setup, and click on the vLookup tab, it says I cannot use vLookup in NewForm.aspx. Is that true for using this specific process, where I am doing the prefill? Do I need to add that receiver file, in addition to the DFFS setup in my NewForm to get it to work for prefill?