Some suppliers require an account identifier to be present on submitted forms to identify a particular practice location. These account identifiers are provided by the supplier.
To support this:
an entityLink.supplierLocation is required between the supplier and practice location
This will have a single node, accountId
an xpath extension function is required to retrieve the node
As forms don't have access to the supplier, the function will need to accept a hard-coded identifier corresponding to the supplier. E.g.:
This would be used as: