Search Help to Custom Filter Field in "Manage Customer Line Items"

[ShishirP]

Hello,

 @Andre_Fischer,

         I came across your reply related to one of the issues that I am facing and was wondering if you might be able to guide me on below. 

https://community.sap.com/t5/technology-q-a/redefined-service-new-entityset-methods-did-not-get-crea... 

I am to make changes to "Manage Customer Line Items" OR FAR_CUSTOMER_LINE_ITEMS (Redefined) to accommodate custom field 'PARVW' OR 'Partner Function'. So far I have managed to

1. add my custom field 'PARVW' to structure FAR_IFIARLINEITEM_EX.
2. I was able to populate this field using method ITEMSET_GET_ENTITYSET. 

Now the problem :-

 After I added this field 'PARVW' to the filter, how do I provide the Search Help for the new custom field 'PARVW'? 

I tried to attach a search help H_TPAR to the new entity using  the solution I  found https://www.samplecodeabap.com/sap-segw-odata-mpc_ext-define-code-collection/ , but since this is a redefinition of standard service when I debug to check the newly added entity  cannot be accessed and since it cannot be accessed I cannot populate it.

Since it is allowed to add custom field to filters, I am hoping that there is probably a way to attach the search help to same. How can I get the filter to work for custom field 'PARVW'? 

Your help would be highly appreciated.