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If you are not purchasing the property together with your husband then this is both a standard issue and also a requirement. The mortgage lender would not give your husband a mortgage unless you signed the document.
Assuming that the document is in standard form, it does not mean that you do not have an interest in the propert. It just means that you cannot claim any interests ahead of the lender. This means that you cannot subsequently attempt to claim money from the Equity of the property before the lender. Essentially it means that the lender will have first call on the Equity of the property, which means that they would be repaid the amounts owed on their mortgage before anybody else including you.
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