Selection save into not working in grid field

What is it supposed to do? More details on the requirement might help us understand the expression or what you have tried.

Any response for the above?

Hi, I don't understand why else condition logic would work according to you. 

but here is the logic for your requirement, you can optimize it ->

     selectionSaveInto: {
          ri!selectedItems,
          a!save(
            local!currentSelectedRow,
            fv!selectedRows
          ),
          a!save(
            local!currentDeSelectedRow,
            fv!deselectedRows
          ),
          if(
            contains(
              touniformstring(
                property(
                  ri!selectedRow,
                 "id",
                  ""
                )
              ),
              tostring(
                property(
                  local!currentSelectedRow,
                  "id",
                  ""
                )
              )
            ),
            {},
            {
              a!save(
                ri!selectedRow,
                append(ri!selectedRow, fv!selectedRows)
              )
            }
          ),
          if(
            rule!CPPS_checkIsNull(local!currentDeSelectedRow),
            {},
            a!save(
              ri!selectedRow,
              remove(
                ri!selectedRow,
                wherecontains(
                  tostring(
                    index(
                      local!currentDeSelectedRow,
                      "id",
                      ""
                    )
                  ),
                  touniformstring(
                    index(
                      ri!selectedRow,
                     "id",
                      ""
                    )
                  )
                )
              )
            )
          ),
         
        },