E-Recruiting Addition field to Infotype 5107

Question

I'm implementing E-Recruiting for a client.
I added the additional field to infotype 5107 Desired Work Location using PPCI. I also created a custom table for Desired Work Location to store the value of Location (county, institution & etc.).  When I added the new field to the infotype 5107 it automatically shows up on the Desired Work Location of E-Recruiting page as a text field.    I found the bsp for this page it's desLocn_detail.bsp.   Also I have to set two field that are already on the page Country and State to a default value.  Both are drop down list.
Here's my question:
1.I would like to make the new field list box i think that's what it is called, where the candidates can select multiple locations.  How & where can i do this? And how can i link the value from the custom table that i created to the new field that I added to Infotype 5107 to appear on the list box?
2.How and where can I set Country and State field to the a default value? Is this done in the IMG?
3.I'm assuming the deslocn_detail.bsp is a SAP standard BSP.  should I modified this bsp to rendered what I'm supposed to do?  If i modified this page when the upgrade/service pack is applys my modification will be wiped out?
any suggestion will be helpful.

Answer 1

I think you should take the following approach:
The only sane way to keep multiple values in a single database record that comes to my mind id to create a new table to keep the selections.
It's key should be the same as of the HRP5107 table plus a sequential number for counting selections.
There are further 3 things to consider:
1. Filling up the table before display with current selection.
2. Handlig user selection after submit.
3. Hiding the text field from user input.
ad 1.
I havn't used <htmlb:listbox> before, so I might wrong somewhere, but i guess that you should prepere two tables and pass them to table and selection attributes.
Probably it would be best to store them as attributes of the controller to provide easy access from the bsp.
The proper place to fill these structures is the DO_REQUEST method, probably near the end of the method when all standard stuff is done.
In this method you should read the configuration of available loactions and put it in the 'table' attribute,
and read the table of selections and put them in the 'selection attribute'.
ad 2. The place to handle input is the DO_HANDLE_DATA in the controller. As i've said a haven't used listbox, but probably the are multiple fields with the id of the listbox, each containing a selected item.
You should read them here and place them in the 'table' attribute.
Next you have change the on_save method in the controller (Actually it might be in a parent controller - i haven't checked it).
In there you should insert the values in the 'table' attribute to the custom table with selections (probably you have to delete all entries for the current infotype record first)
ad. 3
Now that i wrote 1 and 2 i see that you can just remove the field from the infotype...
Hope this helps.