Simple search not working on dynamically setting search value for Activity2 Itemtype?

Hi Team,

I have Item A and have "Activity2" relationship Item. I m setting search value for one of the field in Activity2. On clicking of search it not working.

Following is way I am setting field search value

//Setting filter value in search dialog box
var Filter = {};
Filter["proj_num"] = { filterValue: 1333|1393, isFilterFixed: false };
return Filter;

proj_num is one of the OTB field in form

But if I Manually search with same value(1333|1393) it give result.

I don't know what is going wrong. Any one please can help me out of this?

Thanks in advance