1. I have a collection, that is displaying value as dropdown binds in the items of dropdown

2. Items- Filter(EntityFilter, Default_YN=true).Title
Entity filter is a collection, because true or false not working as expected. so did a collection and filter values based on that.
DefaultSelectedItems value is set as- EntityFilter.ID

3.In DataCard -update, using below code
DataCard -update- ddlEntity.SelectedItems
4.
Need a help on below,
I have a patch and try to update, the below code, but it fails
Patch(MainList,
Defaults(MainList),
{
Entity:
{'@odata.type':"#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
Id:ddlEntity.SelectedItems,
Value:""}
}
)

I assume in selected item of odata, we need to pass id, but dont know how to pass the id.
Step:5
In the same way i have multi lookup to save in to sharepoint list- do share some light on it.
a. In start up of - setting lookup by filtering data.

b.In screen visible i am setting the below code in collection

c.And binding the value dpssExemptedYes in Items of the control
Patch(
MainList,
Defaults(MainList),
{
Title:lblTitle,
DPSSExemptedList:
{'@odata.type':"#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
Id:dpssExemptedYes,
Value:""
}
}
)
Can anyone assist me to save multi lookup values to list