Add message to constant file

Author: yashmeet29

sdm/src/main/java/com/sap/cds/sdm/constants/SDMConstants.java

@@ -71,6 +71,7 @@ private SDMConstants() {
   public static final String DRAFT_READONLY_CONTEXT = "DRAFT_READONLY_CONTEXT";
   public static final String FAILED_TO_COPY_ATTACHMENT = "Failed to copy attachment";
   public static final String FAILED_TO_FETCH_UP_ID = "Failed to fetch up_id";
+  public static final String FAILED_TO_FETCH_FACET = "Invalid facet format, unable to extract required information.";
 
   public static String nameConstraintMessage(
       List<String> fileNameWithRestrictedCharacters, String operation) {

sdm/src/main/java/com/sap/cds/sdm/service/handler/SDMCustomServiceHandler.java

@@ -40,7 +40,7 @@ public SDMCustomServiceHandler(
   public void copyAttachments(AttachmentCopyEventContext context) throws IOException {
     String[] splitFacet = context.getFacet().split("\\.");
     if (splitFacet.length < 3) {
-      throw new ServiceException("Invalid facet format, unable to extract required information.");
+      throw new ServiceException(SDMConstants.FAILED_TO_FETCH_FACET);
     }
     String facet = splitFacet[2];
     String upID = context.getUpId();