Not able to use SRW.USER_EXIT in oracle forms.

Question

Hi,
Below is my requirement in oracle forms:
I have a query form, which has Inventory Category Set field and Category 'From' and 'To' fields. Based on the values selected by the user for Category Set, possible combinations for Categories should be displayed in Cateogory 'From' and 'To' fields. Upon clicking the 'Find' button, only the items which belong to this category set and the range of Cateogies selected should be displayed.
Note that 'Item Categories' Key flex field should be used here. Number of Segments for each Category set will differ. To acheive this, I have attached the Key flex field to the Cateogory 'From' and 'To' fields.
In the PRE-QUERY trigger of the datablock, I have to use where condition to filter the items based on the category sets and categories. This where condition should be generated dynamically based on the search criteria.
In oracle report, we have provision to use the below USER_EXIT to get the where condition to append to my PRE-QUERY statement.
SRW.USER_EXIT('FND FLEXSQL CODE = "MCAT"
OUTPUT = ":P_WHERE_CAT"
APPL_SHORT_NAME= "INV"
MODE = "WHERE"
DISPLAY = "ALL"
NUM = ":P_STRUCT_NUM"
TABLEALIAS = "MCA"
OPERATOR = "BETWEEN"
OPERAND1 = ":P_CATEGORY_FROM"
OPERAND2 = ":P_CATEGORY_TO"');
But in forms, I am not able to use this USER_EXIT. Please let me know the alternate ways to get the where condition dynamically in forms.
Thank you in advance.
Regards,
Kalyan

Answer 1

RAISE APPLICATION_ERROR built-in is raised in a DB procedure/function or trigger.
You can write an ON-error trigger that will trap any DB error messages
or
You can use Dbms_Error_Code & Dbms_Error_Text for trapping the Error.