package uk.ac.wellcome.models.transformable.sierra

import java.time.Instant

case class SierraItemRecord(
  id: String,
  data: String,
  modifiedDate: Instant,
  bibIds: List[String],
  unlinkedBibIds: List[String] = List(),
  version: Int = 0
)

package uk.ac.wellcome.models.transformable.sierra

import java.time.Instant

case class SierraItemRecord(
  id: String,
  data: String,
  modifiedDate: Instant,
  bibIds: List[String],
  unlinkedBibIds: List[String] = List(),
  version: Int = 0
)

object SierraItemRecord {
  def apply(id: String,
            data: String,
            modifiedDate: String,
            bibIds: List[String]): SierraItemRecord =
    SierraItemRecord(
      id = id,
      data = data,
      modifiedDate = Instant.parse(modifiedDate),
      bibIds = bibIds
    )
}

--- 
+++ 
@@ -10,16 +10,3 @@
   unlinkedBibIds: List[String] = List(),
   version: Int = 0
 )
-
-object SierraItemRecord {
-  def apply(id: String,
-            data: String,
-            modifiedDate: String,
-            bibIds: List[String]): SierraItemRecord =
-    SierraItemRecord(
-      id = id,
-      data = data,
-      modifiedDate = Instant.parse(modifiedDate),
-      bibIds = bibIds
-    )
-}
Remove an unused apply method
