How to make a select list to return value to numeric column?

I do have a select list with static values (STATIC:01;0,02;1,03;2,04;3,05;4,06;5,07;6,08;7,09;8,10;9). The problem is that I am returning a value to a numeric column. Therefore I have set 'Post Calculation Computation' as "to_number(:P73_MRGRATING, 9);" however I am getting ORA-01722: invalid number. How, (or when and where) to properly convert a character from a select list representing a numeric value into column of NUMBER data type?
Thank you for your time.
DanieD

Sergio,
It is because I am not able convert a value in a page item (:P73_ID) to number. On a page before, I have assigned a value to an application item (APPL_ID). On page 73, I want to assign the value in APPL_ID to the page item P73_ID . The value assigned to APP_ID is numeric. On a page 73 I also have a computation in Page processing section. It is an 'After Submit' processing of a static assignment of application item APPL_ID to page item P73_ID. Unfortunately it does not work. (ORA-01722: invalid number). I have tested this also with a 'Post Calculation Computation' on page item P73_ID (to_number(:P73_ID, 9999999999);) and I am still getting ORA... error. Only way I can make it work is to create a page item P73_ID as a text field, then when I run page 73 and enter a value into P73_ID manually - then it works and I can save the values from the form into database...
The strange thing is that I am using application item APPL_ID on a couple of pages, in where clauses and it always works, even when I am comparing APPL_ID against a numeric value like select * from a_table where some_number = :APPL_ID, this works. But when I would like to create an entry form and assign application item APPL_ID to the page item P73_ID that is referencing a numeric table column â then I am getting ORA-01722â¦
Is there any application (sample application) that is doing this and it works so I can check it and learn how to create this process appropriately?
Thank you for your time.
DanielD

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How to make a select list to return value to numeric column?

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