Creating records in portal doesn't work when related record is in external data source
Description of the issue
FileMaker Pro 10.0.3, Windows XP SP3, MySQL 5.1.39 I create a portal to a related record with the layout showing records from an FM table, and the portal showing records from a MySQL shadow table. The relationship allows creation of records in the MySQL table through the relationship. Indeed, the usual "extra" portal row for creating records is displayed. However, when I type into any field and tab out of it, I get an error: This action cannot be performed because this field is not modifiable. I have verified that the layout field allows entry in Browse mode. I can workaround by adding a button to create a new record with the right fields set up, but it's ugly and different from what the users are used to.