If you can't save your quote, there may be a couple of things happening but it's usually down to a piece of information missing from the form. Some of the sections on the quote form are mandatory, which means you can't move forward without them.
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In order to make sure that you have all of the sections filled in, look out for the boxes that are highlighted in red. This will usually occur with the message 'missing value.' If you see this, just fill in the box and proceed with your quote. 

The missing value message looks like this: