Inserting a db row from a form with a value passed in from another page

We have a report (P1) on a table (T1). P1 has a link column (C), and C is the PK on T1. Clicking on a link (i.e., a row) in report P1, takes us to form (P2). P2 is used to allow the user to insert a new row into T1, with the constraint that one of the columns (X) in T1 must have the same value as X had in the linked row on P1. Also, X is a NOT NULL attribute.
What we are doing is:
First, passing C to P2 by setting the link name=P2_X_C and the link value=#C#
Second, in P2, we are setting form element P2_C via a SQL statement:
SELECT X
FROM T1
WHERE C = :P2_X_C
P2 displays nicely. We set P2_C to display only, and allow the user to enter values for the other columns. The value displayed for X is not NULL and correctly matches the value from P1. However, when we hit the CREATE button on P2, we get error: ORA-01400: cannot insert NULL into "T1"."X". Unable to process row of table T1.
APEX seems to have an "issue" with having a value in a form "set" and transmitted to the DB on INSERT.
Any help would be greatly appreciated.

Hi,
1 For "Display Only" items that you are not populating directly from a database column, if you want to save the value, you have to ensure that Save Session State is set to Yes and these items are not actually submitted with the page. The same sort of thing would apply to Disabled or Read-Only items as browsers do not submit these items - though these are more tricky to deal.
2 Passing the PK value is the most common way of identifying which record contains the values you need. Passing other values is also typical - eg, for applying filters for calendars or searches or for setting flags.
3 For database columns, which should be based on the underlying table's data, you can use the Default Value settings - though be aware that these values do not exist in session state until the page is submitted. That's ok if you don't need to use the value anywhere else on your page
Andy

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