Update all rows in a View Column via one Apex Form field

Appreciate any helpful answers to this query.
I have an Apex App (4.x) where I have a view: PRICE_MODEL_CRA_V
In the view, I have the following applicable columns:
COUNTRY
GRADE
SALARY
In the form I have the following fields
:P16_COUNTRY (DROPDOWN)
:P16_GRADE (DROPDOWN)
:P16_SALARY (Number)
In my app, I have a form with an Update button. I am simply trying to get Apex to update all rows in the salaray column in the view, where the country and grade match.
I've the following code for the Update button:
UPDATE PRICE_MODEL_CRA_V
SET SALARY = :P16_SALARY
WHERE COUNTRY = :P16_COUNTRY
AND GRADE = :P16_GRADE
The option I have chosen in condition type is:
Value of Item / Column expression is NOT Null (as there are values in the column)
Also tried SQL Expression and it does not like..says that there is No Expression.
Thanks again if anyone can help :)

Hi,
Sorry I realize now that piece of information was not well supported.
If I choose SQL Expression for Condition Type in my Form Page and I try to Apply Changes
Apex says this..
•Failed to parse SQL query!
ORA-00936: missing expression
I was assuming that I need to have the colon for the items in the form where I am wanting Apex to grab the values entered by the user. I tried them without the colons with the SQL Expression condition and same result.
UPDATE PRICE_MODEL_CRA_V
SET SALARY = P16_SALARY
WHERE COUNTRY = P16_COUNTRY
AND GRADE = P16_GRADE
I did put 1-1/0 in my expression field and applied changes and then tried ot submit the form and it does not produce an error, so perhaps it is not being called? Where would I start with troubleshooting that?
Thanks,

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