Hi I am designing base plate and I am getting this warning. hef is outside of approved values [128 mm; 640 mm]. Please guide.

Thanks for asking the question..
The Post Installed Bonded Anchors are tested as per criteria mentioned in European Assessment Document, commonly known as EAD 330499 and the test results are mentioned in ETA documents. The values mentioned in ETA are utilized to design connections as per EN 1992:4.
What I can sense from your question that the diameter of threaded rod/rebar which you must have selected is outside the range of 20 times diameter of rod/rebar (maximum allowable depth as per EAD and design code) and that's why you're getting this warning because the solution is not compliant as per EAD and EN 1992:4.
In order to go further deeper inside concrete, you'll have to increase diameter and spacing to qualify the design. For design support, please submit your request by clicking on link: Anchor Design Services - Hilti India