I'm trying to use a page item to set the default value for a column in an interactive grid. No problem if the page item is static. But I want to use a dynamic action to set the value for the page item, which will subsequently change the default. The dynamic action is changing the page item, but the default does not change, even though it is tied to the page item (and even if the IG region refreshes as part of the dynamic action - not shown in the simplified example below).
Here's a simplified example in which the page item starts as 12 and changes to 100 when you click anywhere in the IG. The item (displayed at the top) changes to 100, but the default stays 12 if you try to add rows.
https://apex.oracle.com/pls/apex/f?p=155774:3:112390685420482:::::
And screenshots from relevant parts of the page designer:
