The first step is evidence that the old secured debt has been paid in full. Section 469 ABGB refers to a receipt or another deed showing that the secured debt has ended. A bare assertion or an untraceable payment leaves the evidentiary chain incomplete.
The current land-register position must then be checked. The mortgage must still be registered because the possibility of transfer is linked to the existing entry. If it has already been cancelled, that particular mortgage position cannot be continued on this basis.
Finally, the amount of the new claim must remain within the registered secured claim. The land-register extract, the old mortgage deed, the repayment evidence and the deed for the new claim should therefore be read together. This shows whether amount and legal allocation match.