“No Primary Key item has been defined for form region”
Otherwise reported as “WWV_FLOW_FORM_REGION.NO_PRIMARY_KEY_ITEM” or merely “Internal error”, this bug caused me to waste hours of investigation, twice, because a simple Google search was not returning any results. This post is merely to remedy that situation.
On an APEX 19.1 page with a new Form region combined with an Interactive Grid region, when the user makes a change to a record and Submits the page, they get this error.
This is caused by bug 29612553 – FORM REGION DML PROCESS THROWS INTERNAL ERROR WHEN INTERACTIVE GRID DML PROCESS IS ON THE SAME PAGE and fixed by APEX patch 29369869.