Setting a Default Value within a Tabular Form

Hi All,
Using Apex 2.2.1
Hoping someone can assist. I have the following two scenarios where I would like to set a default value to a column within a tabular form.
Scenario One:
Prior to actually displaying the tabular form on the page, I have a region on this page where I ask the user to select a Application No. first (using a Select List with Submit). Once this item, say P50_APP is set to a value, the Tabular Form region is then presented to the user by where I then allow them to enter certain information required using the 'Add Row' button. One of the columns within this tabular form also represents the Application No.
My questions are:
a) I have made the Application No. within the tabular form as a LOV, so when the user hits the 'Add Row' button, how can I set the initial value to P50_APP value using the 'Default Type and Default' items within the column?
b) Since I am trying to achieve a master-detail type scenario here, if (a) above is not possible, if I hide the Application No. column within the tabular form, how can I set it to P50_APP when the user presses either the 'Add Row' or 'Submit' buttons?
Scenario Two:
Is it possible to pass a value from a tabular form, i.e a column within this tabular form on one page, to another tabular form column on a another page (when the user presses the 'Add Row' button) within the same application?
For example, on page 50 I have the column #APP_NUMBER# passed onto page 60 which is another tabular form that also holds the same column name #APP_NUMBER# , so when the user on page 60 hits the 'Add Row' button, I would like the App Number column default to the one just passed over from page 50.
Is this possible?
Apologies if I am asking the same things in both scenarios - just want to make sure I understand MRUs.
Thanks.
Tony.

Hi Andy,
Thanks for getting back to me but I think you are referencing these default values in the wrong section.
What I am actually trying to set is the value of a column within a tabular form to P50_APP and it seems to me that the only available options for setting default values on a tabular form column are by using:
Default Type: which can be one of:
No Default
Item (application or page item name) or
PL/SQL Expression or Function
and then actual source is set against:
Default:
Unsure as to how to actually set the value of P50_APP which is in session to the individual tabular column mentioned above.
FYI, I have tried selecting for Default Type: Item (application or page item name) and then specifying for Default:&P50_APP. as well as Default Type:PL/SQL Expression or Function and specifying for Default: :P50_APP but to no avail.
Tony.

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Setting a Default Value within a Tabular Form

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