Hi Yash,
As I told you, the import parameter is not set. And as this is a standard search help, you cannot set the import parameter. For your reference I have attached a screenshot, have a look at the import parameter of SAKNR. Thus you have to manually write the name of the field value of SAKNR in the text box, or else make a search help with the same fields and data element.
Regards-
Chirag Keswani