How to Restrict the values of Field TASKTYPE on a ALV Grid.?

Hi;
Let me explain my problem. I have report written by another abap developer who has gone now.
On the ALV Grid there is a field called "Activity Process". By F1 F9 I can read that field depends on table TCATX_TASKTYPES and field TASKTYPE . From se11 I can see that there is no search help related with the field.
When the user press F4 all the data in the table is listed . The user want to filter some of the listed data according to same logic .
When I debug the code after F4 on the field I found that the system finds Search Help: TCATX_TASKTYPES of type 'CT'. But unfortunately SE11 says that there in no search help such as TCATX_TASKTYPES.
The previous abap developer used BADI NETW_USER_FIELDS_F4 AT_F4 with class ZCL_IM_NETW_USER_FIELDS_F4 and interface IF_EX_NETW_USER_FIELDS_F4 for the transaction cj20n to filter the same field but this is not triggered by the F4 on the ALV Grid.
What can I do ?
Would you please help me ?

I know i can do this using ADF Business Components as the business service but the problem is that the initial value for that attribute will be changed depending on the screen ... ill give u a simple example : lets say that I have employee table ( which include dept column) and under that table I have a table called "Emp_dept_movements" now in the main ADF page "employee entry" I have two blocks Employee data ( master view) employee dept data ( detail view ) now when the user press the create-insert button on the employee dept view the system should copy the dept no from the employee view to the dept no on the emp_dept_movements view... and the "Emp_dept_movements" will be used in another screen called " employee departement movements" without any initial value for the DeptNo
I dont want to create more than one view and cant set the initial value for that attribute in the view , Can this be done through the UI by adding set action listener on that button and specifying from ( binding master_view.dept ) - to (binding of detail_view.dept) ..
hope that am clear this time,
Edited by: Delta on Jul 5, 2010 11:21 PM

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