It could very well be problematic!
or not.
That really does depend what is in it!
I do not know so cannot comment.
All it means is "We can't yet approve solely on the basis of what has been submitted thus far!".
Rectification could be trivial, minor, major, or impossible - depending on what has been asked for!
Without further detail, I would not draw any conclusions beyond that!
A minor deficiency notice is a non event. But a major could end up proving hard to traverse.
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