The rules are applied from most specific to less specific, using the first found in this order:
To modify a rule, create a new one with the same patron type and item type.
For this library, you can specify the maximum number of loans that a patron of a given category can make, regardless of the item type.
If the total amount loanable for a given patron category is left blank, no limit applies, except possibly for a limit you define for a specific item type.