Index: book_manager.batch.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/book_manager/book_manager.batch.inc,v
retrieving revision 1.1.2.3
diff -u -p -r1.1.2.3 book_manager.batch.inc
--- book_manager.batch.inc	8 Dec 2010 01:41:11 -0000	1.1.2.3
+++ book_manager.batch.inc	20 Dec 2010 23:11:01 -0000
@@ -66,7 +66,7 @@ function book_manager_batch_process($nod
 /**
  * Implementation of hook_book_manager_batch_operate on behalf of og
  */
-if (module_exists('og')) {
+if (module_exists('og') && !function_exists('og_book_manager_batch_operate')) {
   function og_book_manager_batch_operate($node, &$node2) {
     $node2->og_groups = $node->og_groups;
   }
@@ -75,7 +75,7 @@ if (module_exists('og')) {
 /**
  * Implementation of hook_book_manager_batch_operate on behalf of og_access
  */
-if (module_exists('og_access')) {
+if (module_exists('og_access') && !function_exists('og_access_book_manager_batch_operate')) {
   function og_access_book_manager_batch_operate($node, &$node2) {
     $node2->og_public = $node->og_public;
   }
@@ -84,7 +84,7 @@ if (module_exists('og_access')) {
 /** 
  * Implementation of hook_book_manager_batch_operate on behalf of og_access_roles
  */
-if (module_exists('og_access_roles')) {
+if (module_exists('og_access_roles') && !function_exists('og_access_roles_book_manager_batch_operate')) {
   function og_access_roles_book_manager_batch_operate($node, &$node2) {
     $node2->og_access_roles = $node->og_access_roles;
   }